Spring is the season of recovery for all plants, and succulents are no exception. Many species are already in full bloom, such as Stenocactus, Strombocactus, many Turbinicarpus and several Mammillaria. Be careful, however, there is a difference between flowering and vegetative growth: a plant can flower even if it has not fully resumed vegetating. Simply, this is its flowering period and the plant respects it even if it is still coming out of the winter “dormancy” state. As regards temperatures, obviously there is a big difference based on the area in which it is grown, so in some regions of the South the night-time minimums can already be above 10 degrees, while in the North we still have relatively low values, around 2 or 3 degrees. This factor is fundamental to understanding whether we can move our plants outside or not. Equally important is the time to resume watering. Can we start watering cacti and succulents these days or is it better to wait a little longer? Finally: with the start of the summer, is it necessary to carry out some treatments with plant protection products or can this practice be avoided?

Let’s see everything in detail in the following article, so as to move correctly and avoid problems or rot damaging the plants. (…)

Succulent plants and springtime: introduction

After a winter spent in vegetative stasis, almost all cacti and succulents start growing again by mid-March. This can be seen above all by the production of new thorns and the resumption of growth of the stem. Flowers, in this context, are irrelevant: plants that flower in spring do so regardless of the vegetative growth. There are several species of Mammillaria, just to give an example, that flower in February, as well as some Ancistrocactus. This therefore does not mean that the plant has started to vegetate again and that we can resume watering. The vegetative growth, essentially, consists in the actual “awakening” of the plant, which begins to grow again, activate the root system and produce new thorns. So let’s not trust the flowers to start watering the cacti again: the risk of them rotting, if the roots are not yet active and the temperatures are still low, is very high!

Check the succulent plants carefully to check their health

A first good practice to implement in spring is certainly to check the plants carefully to check that there are no rot or parasites present. The risk of rot starting immediately after winter is quite high, because mold and bacteria become active as temperatures rise. It is therefore important to examine all the plants to ensure that there are no suspicious stains on the stem. In case of spots or full-blown rot, it is essential to isolate the specimen and treat it (if it is not too late) with a broad-spectrum fungicide. Copper oxychloride can be useful but is not always curative. In the case of fusarium, for example, there is very little to do other than remove the rotten part, brush the wound with powdered copper oxychloride and sulfur and keep the specimen in the air as much as possible and away from other plants. Except for serious rot, a few passes with Neem oil are useful: it is a natural product that offers good protection to plants.

Spots and rot on cacti: what to do.

Temperatures: moving cacti and succulent plants outside?

Temperatures are a fundamental element to consider during this period. Minimums and maximums can vary considerably depending on the geographical area in which it is grown and the weather is not yet completely settled. Given this, if the night-time minimum temperatures do not fall below 3-4 celsius degrees, cacti and succulents can be brought outside, with the exception of epiphytes and genera such as Melocactus and Discocactus, which require minimum temperatures not lower than 10-12 degrees . Those who have left their plants to overwinter outdoors can simply remove the layers of non-woven fabric, or open greenhouses and greenhouses as much as possible. At this stage, temperature changes between day and night can only be good for the plants and the important thing is that cacti and succulents are sheltered from the rain. For the rest, air is essential to avoid mold or fungi, therefore the plants should be placed outside, taking care not to move them into full sun if they have been kept in environments with little light during the winter: in fact it is It is necessary for cacti and succulents to gradually get used to intense light.

The spring and watering: when is the right time?

Seeing the plants shriveled, deflated or simply witnessing sunny days, the temptation to water is strong. These days, however, it is good to restrain yourself and wait a little longer before watering the cacti and succulents. The roots may not yet be active and wetting the soil, especially if the night-time lows are still relatively low, risks triggering rot. A little patience, therefore, and let’s wait a few more days before watering. From the end of March and the beginning of April it will be possible to give a first pass of water. A warning: the first two waterings – spaced at least 20 days apart – must be light. An excess of water, if the plant is already in full vegetation, can cause the stem to split because cacti are very greedy and quickly absorb all the water they have available in a short time.

Here you will find the section with articles dedicated to watering succulents.

Fertilize succulents or wait a few more weeks?

Even for fertilizations it is best to wait. Fertilizing now involves wetting the soil, exposing the plant to risk of rot. Furthermore, it is good practice to add the fertilizer to the water only after having carried out a couple of waterings with water only. In this way the plants are completely reactivated and when we add the fertilizer they will be ready to absorb it and use it according to their needs. Generally speaking, it can be said that it is advisable to wait until at least mid-April for fertilization. Pay attention to the type of fertilizer: specific fertilizers with a low nitrogen content and a high phosphorus and potassium content must be used with succulents.

Here you will find an article entirely dedicated to fertilization.

The spring and treatments: are they really necessary?

Finally, treatments with pesticides in spring. Personally, I stopped using chemical products for years, with the exception of copper oxychloride, which should be given mostly in autumn and, sporadically, during winter. In the summer, if the plants are still in stasis, a spray of copper oxychloride distributed by nebulization can be useful for preventive purposes. If the plants are healthy, a preventive treatment (at a distance from the treatment with copper oxychloride) with Neem oil, a natural product capable of protecting the plants from possible parasites, will be sufficient. Treatments should be carried out in the early hours of the morning or in the evening, never when the plants are exposed to the sun.

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Correlated articles

• How to grow cacti: the handbook
• The section dedicated to soils
• Most frequent questions and doubts
• All cultivation cards in pdf

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L'articolo Spring is here, what to do with cacti and succulents? All out or is it better to wait? proviene da Il fiore tra le spine.

In cacti as well as in many other botanical families, grafting is a common practice, usually adopted to grow delicate plants more easily and to speed up the growth rates of the plants themselves. In short, it consists of combining a delicate plant with a robust plant, which will provide the former with nourishment and encourage its growth.

Those who follow this site know well that the “philosophy” underlying the cultivation of cacti and succulents adopted by me is based on obtaining plants as similar as possible to those in the habitat. My approach to cultivation is essentially simple and spartan and is inspired by the so-called “wild” cultivation method, which precisely has the aim of obtaining cacti with a natural, lived-in appearance and, overall, as similar as possible to what plants have in nature. It is for this reason that it is not my habit to practice grafting cacti, which can certainly be a useful technique in many cases but which does not lead, from an aesthetic point of view, to obtaining specimens similar to those that grow in their habitat. This is not only due to the very fact that one plant grows grafted onto another, but also due to the fact that grafted plants tend over time to take on very different characteristics from those of plants grown naturally. In fact, grafted plants can have much more swollen stems, sometimes deformed compared to the norm and even the thorns can grow differently.

However, given the high number of growers who practice grafting (also useful for speeding up the growth of cacti and making them flower so as to be able to pollinate them to have seeds with which to reproduce them) or who do not disdain the cultivation of grafted plants and considered many questions that they reached me over time via email, here, for completeness, is an article that deals with this practice and explains how to graft cacti (…)

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L'articolo Grafting cactus: when a succulent plant can be grafted and what is the correct procedure to follow proviene da Il fiore tra le spine.

These cacti are easily recognizable by the splendid crown blooms around the apical part of the stem, which can be small or medium in size. These are cacti suitable for expert growers as well as novice growers. Some species, in fact, require a fair amount of experience (among these, Mammillaria luethyi, Mammillaria pectinifera, Mammillaria solisoides, Mammillaria lasiacantha, Mammillaria senilis, Mammillaria herrerae); other species are suitable for anyone (among these, Mammillaria elongata, Mammillaria bombycina, Mammillaria prolifera, Mammillaria polythele, Mammillaria uncinata, Mammillaria bocasana, Mammillaria perbella, Mammillaria mystax). The stems can appear globose, often clustered, very harmonious and in some cases covered with thick hair or very white thorns. (…)

The origin of Mammillaria: where these cacti grow

As regards distribution, Mammillaria are native to the southwestern area of the United States and Mexico, where they grow in many states such as Tamaulipas, Hidalgo, Chiapas, Colima, Puebla, Oaxaca, Baja California, San Luis Potosí, Durango . Some species can also be found in the Caribbean area, in Central America and in some regions in the north of South America (such as Colombia and Venezuela). The range of origin of this genus is therefore very vast and this is also why the Mammillaria have been able to evolve in different ways, giving rise to a large number of species and subspecies.

The main characteristic of the entire genus, regardless of the shape of the specimen, is the presence of tubercles, small “cones” (similar to breasts, hence the name of the genus, from the latin term “mammilla”) which characterize the stem and which can be more or less marked depending on the species. The areoles and spines form at the apex of the tubercles. Some Mammillaria produce a latex that may resemble that contained in Euphorbia. By virtue of this, the distinction between Mammillaria Galactochylus (which contain latex) and Mammillaria Hydrochylus (which does not contain latex) was once in use.

The forms and species of Mammillaria

The thorns can take on many shapes and in some species they are hidden by thick white hair (Mammillaria hahniana). You can have short and pointed spines, long and twisted spines (Mammillaria camptotricha), hooked spines (Mammillaria uncinata, M. bombycina, M. perezdelarosae), as well as “combed” spines (Mammillaria pectinifera) and robust and long spines (Mammillaria compressa, Mammillaria magnimamma). Many species, in particular those traced back to the so-called lasiacantha group, have pure white thorns that completely cover the stem and which can turn gray with age. Among the white-spined species, Mammillaria perbella, M. candida, M. magallanii, M. lasiacantha, M. lenti, M. klissingiana, M. humboldtii, M. albiflora, M. herrerae, M. plumosa deserve mention.

How Mammillaria are grown

As regards cultivation, in general most of the species are also suitable for novice growers, since they are robust cacti and do not require any particular precautions compared to most cacti. Some species, however, can prove particularly challenging, to the point that their cultivation is recommended for those who have some experience with succulents. The particular sensitivity to water stagnation or the presence of taproot, which requires soils that are poor from an organic point of view and rich in aggregates and well-spaced watering.

Exposure and minimum temperatures

Regarding exposure, all Mammillaria want a lot of light for at least 6 hours a day, but only those whose stem is entirely covered with thorns (usually white ones) can stay in direct sun for many hours, as long as they are gradually accustomed to it starting from the end of March.

Mammillaria tolerate the cold well, as long as the soil is dry from the end of September.

Here you will find a PDF sheet entirely dedicated to the Mammillaria genus.

The English association The Mammillaria Society is dedicated to this type of cactus: anyone interested can take a look at their website at this link.

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Photos of some species of Mammillaria

Correlated articles

• How to grow cacti: the handbook
• The section dedicated to soils
• Most frequent questions and doubts
• All cultivation cards in pdf

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L'articolo Mammillaria, a genus of cactus that is essential in any self-respecting succulent collection proviene da Il fiore tra le spine.

Without dwelling too much on the broad field of plant classification (here, if you want, you will find an article dedicated to this topic) and taking it for granted that the term “succulent plants” refers both to cacti and to many other succulent botanical families whose specimens have a different appearance from any other cactus, we are addressing a very “heartfelt” topic among novice growers. Even the grower who boasts a good knowledge of a given family, however, may find the following article useful, which recommends succulent plants (belonging to various botanical families) that are less demanding, more robust and simple to grow and therefore more suitable for those who are only now approaching the world of succulents. (…)

Premise

With a minimum of initial documentation and experience it is possible to grow all succulents without particular difficulties. Striking down to the essentials, the main cultivation elements to take into consideration are the substrates, watering, exposure and temperatures. In many cases these elements may be common to different types of succulents, for example the substrates, which for succulents must always be very draining, rich in inert materials and able to dry quickly. Other cultivation factors, however, can vary enormously from family to family but also from genus to genus. Some examples: cacti tolerate the cold well, while succulents originating from Madagascar or some African areas (e.g. Adenium, Uncarina, Pachypodium) cannot resist temperatures below 15-16 Celsius degrees. In the same Cactaceae family we find genera that are very resistant to cold (Echinopsis, Pediocactus, Opuntia) and genera that do not tolerate low temperatures (epiphytic cacti such as Epiphyllum, Schlumbergera, Rhipsalis or Melocactus and Discocactus).

This is why, for those who are only now approaching the cultivation of succulents, it is important to know which plants to start with in order to accumulate experience and best cultivate the newly purchased plants. The discussion, as mentioned, applies as much to cacti as to all other succulent families, since an enthusiast can be an expert in cacti and approach other families for the first time, such as Crassulaceae, Aizoaceae, Apocynaceae, Euphorbiaceae, etc.

Cactus

Let’s start with cacti. The first genera recommended to those who have no experience with these plants are undoubtedly Echinopsis, Gymnocalycium, Rebutia, Parodia (=Notocactus), Opuntia, Ferocactus. Be careful, there are many other cacti that are easy to grow but if you have to suggest some kind, you can’t go wrong with these. These are genera that group together very robust species, with few demands, capable of tolerating many cultivation errors and at the same time easily giving abundant and splendid blooms.

Attention: in some cases by clicking on the genus you will be directed to the downloadable PDF cultivation sheet of that same genus: a useful and detailed tool (4 pages) to deepen your knowledge of those plants.

Echinopsis are very common plants, extremely robust and able to tolerate the cold very well. They are therefore ideal for those who do not have a greenhouse or winter shelter (cold environment, necessary to encourage flowering). Echinopsis can spend the winter outdoors, often even in damp soil, although it is advisable to place them under a shed or porch. In spring and summer they produce showy flowers with a large corolla and long calyx.

Gymnocalycium are plants of South American origin (Argentina). They are easy to grow, tolerate the cold well (not frost: it is best that they do not go below 5 Celsius degrees and always in dry soil) and have growth rates that are not particularly slow. Furthermore, the genus brings together a large number of very different species and even just by cultivating Gymnocalycium it is possible to set up a very respectable collection. They flower in spring and summer already 4 or 5 years after sowing.

Other cacti recommended for those with little experience are the Rebutia. These are plants of South American origin, generally globose and with a tendency to cluster. Cultivation is very simple and their strong point are the flowers. In spring, these cacti produce an impressive quantity of medium-sized flowers of various colors depending on the species.

Parodia (once classified as Notocactus) are robust and very easy to grow cacti. They are satisfied with little care, have growth rates that are not excessively slow and produce beautiful blooms at the apex during the summer. Depending on the species, the flowers can be yellow, purple, red, orange. Even the thorns are variable from species to species and you can go from plants with slender and thin thorns to plants with very respectable thorns (P. maassii, P. buiningii).

Opuntias are bombproof cacti. They grow quickly, tolerate intense cold, multiply extremely easily by cutting and in many countries they can grow in the open ground, even exposed to bad weather during the winter. They can reach large dimensions (especially if grown in open ground) and produce beautiful flowers with colors ranging from pink to red, from yellow to orange.

Finally, for lovers of thorns, the first genus to recommend is Ferocactus. These are very robust cacti, always equipped with notable thorns, easy to grow, as long as they are guaranteed plenty of light, and grow relatively quickly. Some species flower relatively early (F. macrodiscus, F. schwarzii), others require at least a dozen years to produce the first flowers. Many species of Ferocactus can reach considerable dimensions even if grown in pots. However, those who have little experience with cacti should avoid starting with Ferocactus johnstonianus and Ferocactus lindsayi: two slightly more demanding and slow-growing species.

Crassulaceae

If you’re not particularly fond of thorns, the Crassulaceae family offers a wide variety of succulent genera and species. This family includes genera such as Aeonium, Adromischus, Crassula, Echeveria, Kalanchoe, Graptopetalum, Pachyphytum and the immortals Sedum and Sempervivum. Recommending a genus or a single species is almost superfluous: all Crassulaceae are easy to grow, very decorative, resistant and have good tolerance to cold. Having to indicate a couple of plants of this family, we can mention the very widespread Crassula ovata, called “jade tree”, with a small tree shape and oval, fleshy and bright green leaves. Another very interesting genus from an aesthetic point of view and easy to grow is that of Echeveria: plants of Mexican origin, very robust and with a characteristic rosette shape. Thanks to the high number of species and the many crossings carried out over the years, an infinite variety of Echeveria is available, with colored leaves that can range from blue to red.

Euphorbia

The Euphorbia family is very vast and includes very different genera. You can go from plants with a rounded stem without thorns, such as E. obesa, to plants with a columnar, curled shape, with leaves and thorns. Overall, the cultivation of Euphorbia is simple, but there is no shortage of species that require some experience. To begin with, E. resinifera, a very resistant and adaptable plant, E. enopla and E. obesa, beautiful and with an epidermis characterized by fascinating striations, can be indicated.

Agaves

It’s hard to go wrong with Agaves. These are very robust succulents, extremely adaptable and very easy to grow. In reality, they can almost be ignored completely: if placed in draining soil they are satisfied with rainwater, they resist intense sun and cold very well, to the point that in many regions they are grown in the open ground. They have rather rapid growth rates and many species can reach considerable sizes within a few years, particularly if kept in open ground.

Aloe

Even Aloes, in some ways similar to Agaves, are succulent plants suitable for those who are approaching the world of succulents and do not yet have much experience. Compared to Agaves, however, Aloes (succulent plants of African origin) tolerate intense cold less and should be kept at minimum temperatures no lower than 6-7 degrees. To begin with, you can start from the common but always elegant Aloe vera, a robust and relatively fast growing plant. Other very widespread and easy to grow species are Aloe arborescens and Aloe variegata, very easy to propagate and very generous with blooms.

Hoya

Finally, a succulent plant belonging to the Asclepiadaceae family. Hoya has seen its popularity grow among green enthusiasts in recent years. Aesthetically it has little in common with other succulents, but it is still a very decorative plant, also suitable for home cultivation and capable of producing beautiful cluster blooms. The star-shaped flowers are very particular, they have fleshy and smooth petals to the point that the Hoya themselves are also known as “porcelain flower” or “wax flower”. The plant produces long stems from which thick and fleshy leaves are formed, ranging in color from dark green to bright green, up to green streaked with yellow. Cultivation is simple and growth is relatively fast. Furthermore, Hoya also tolerate relatively low temperatures well, around 10 Celsius degrees.

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Correlated articles

• Recognising succulents plants and cactus
• How to grow succulents
• Most frequent questions and doubts
• All cultivation cards in pdf
• Distribution of cacti and succulents: maps

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L'articolo Succulent plants, a small guide for those approaching this world: the simplest species to grow proviene da Il fiore tra le spine.

Among these, some species of Echinocereus, as the plant you see in the photo, which I had given up for dead, and whitch instead was reborn after two winters spent entirely outdoors, exposed to the cold and humidity whitch characterizes northern Italy. In this article here is the history of this plant and a brief overview of the succulent plants that we can keep outdoors all year round. (…)

Premise

The precautions we take to protect our succulents during the winter months, particularly in the Northern regions, are important. Yes, because if it is true that most cacti and many succulents (to understand the difference between cacti and succulents you can read this article) have good resistance to the cold, it is equally true that too much watering or a night frost is enough to seriously damage these plants or, potentially, trigger rot, particularly if the cold is accompanied by prolonged environmental humidity conditions. Moving the plants to a place sheltered from the rain, covering them with various layers of non-woven fabric, sheltering them in not cramped greenhouses and airing them on sunny days is certainly the best solution to minimize losses. In some cases even this is not enough: think of cacti such as Melocactus, Discocactus and all epiphytes, or succulents originating from Madagascar and some African areas, such as many Euphorbias and all Adenium obesum. All these plants require minimum temperatures not lower than 15-16 Celsius degrees and must therefore be brought indoors from at least mid-October, when the night-time minimum temperatures begin to drop significantly.

Here you will find an article with two downloadable PDF handbooks with the ideal placement for the various succulents in winter.

The Echinocereus returned from the cold

Having made the necessary introduction, here is the story of this Echinocereus of mine who wanted to amaze me, at the same time giving me an important lesson and reiterating the concept – which I have already assimilated thanks to other experiences in the past – that with succulent plants it is important not to give anything for granted. The plant in question is an Echinocereus laui. I grow a few specimens of the Echinocereus genus and I grow them mainly for the flower, since I don’t find the stems or thorns of these plants particularly attractive (with a few exceptions such as E. lindsayi). The plant you see in the photos has been with me for several years. Doing some quick calculations, just under twenty years to be more precise and the story of his “apparent death” and rebirth (in the cold) dates back at least four years. Initially this plant, which I took while still very small, in a 6 or 7 centimeter pot, grew regularly, soon starting to take on its columnar shape (although its size was limited to about fifteen centimeters) and to flower regularly.

At a certain point, years ago, the main stem sent out a branch and the plant, little by little, took on a “double” appearance: over time the stem and the branch in short reached the same height. Well before the branch reached the main stem, however, the latter began to bend significantly, to the point that I decided to tie it to a plant support. In those years the plant grew regularly and flowered, as can be seen from the photo on the side. After further years, when the two stems were now even, the Echinocerus began to slow down its growth, until it stopped completely. The apex did not develop and did not produce new spines. In the meantime, the stems were bending more and more noticeably despite the support and the lower part of the plant began to take on a grey, not at all encouraging, appearance.

After a couple of seasons, seeing that the Echinocereus showed no signs of recovery and that the entire stem had now taken on an ugly greyish colour, I thought there was nothing left to do. The plant did not grow or flower. It showed no obvious signs of rot but the color of the stem seemed like a complete condemnation, to the point that I didn’t even bother to dig up the plant and check the roots. Considering it to be in fact already dead, I limited myself to removing it from the greenhouse and taking it outside, placing it along a low wall where I usually leave the plants affected by some fungus or otherwise dead. The wall is located along a field and offers no shelter from the rain and, obviously, from the cold. I use it mostly to let the plants go in peace when I think there’s nothing left to do…

The Echinocerus spent the final part of the summer in that position, the entire following winter and, since I completely forgot about it, the entire year after that, including the winter. Only after a year and a half, therefore, did the plant manage to attract my attention. How did it do? Simply flowering, so that while hanging out near the greenhouse I spotted a couple of spots of color in the distance (Echinocereus laui produces beautiful magenta flowers, not as large as those of other Echinocereus but still very showy). Not without surprise, I approached the wall after almost two years and discovered that the Echinocereus had not only survived two winters in the cold, in full humidity and receiving the rain that had fallen in all that time, but had started again. The recovery was evident: the apical part of the two stems was green, the plant had produced new thorns perfectly identical to the old ones, and had flowered. As proof of all this, here in this article are some of the photos I took on that occasion.

Here’s a good lesson for me: the plant I had given up on had come back to life, in my face, and had attracted my attention by starting to flower again. All this without any treatment from me, in fact, resisting the cold and humidity of two winters and returning to grow as if nothing had happened. Obviously, as soon as I discovered that the Echinocereus was in full vegetation and, even with the old part of the stem still grey, I brought it back to the greenhouse, where it is still found today and where every year the two stems, increasingly longer and increasingly prostrate (I gave up the support, letting the plant take on the shape it wanted or needed to take on) they regularly give me splendid blooms in late spring. Once again Nature has shown me that, no matter what we do, in the end it is always and only she who decides.

Succulents that tolerate cold

Despite the “rebirth” of my Echinocereus, it must be said that this genus of cactus is among the most inclined to tolerate low temperatures. Of course, as a precaution I don’t recommend keeping your Echinocereus outdoors all year round, also because some species resist better than others and not all would survive, but the genus is robust, there’s no doubt about that. 

As regards, more generally, succulent plants that tolerate the cold well and that we can leave outdoors all year round, albeit with some precautions, here is a small overview based on my experience over many years of cultivation.

As obvious as we want, but among the first succulents that have a good relationship with the cold we cannot fail to mention the Agaves. In many areas of Italy (even in the North, particularly in the areas close to lakes) and in southern France (French Riviera) these succulents can also be grown in the open ground. In pots they can remain outdoors all year round, although the advice is to keep them under sheds or porches to prevent the soil from remaining constantly damp. Among the Agaves, the exception is the macroacantha species, which cannot resist intense cold and excessive humidity. This species must therefore be sheltered and kept at temperatures no lower than 3 or 4 Celsius degrees. Also be careful with Aloes, which many mistakenly associate with Agaves. Aloes are plants of African origin and require significantly higher minimum temperatures than Agaves (although 6 or 7 Celsius degrees are sufficient) and should not be watered in winter.

Still remaining in the field of non-cacaceae succulents, the Sempervivum and Sedum (genera belonging to the Crassulaceae family) should be mentioned without hesitation. For these plants, which also grow in the mountains, winter is a… walk in the park and they thrive better in the cold than closed in a greenhouse or sheltered by layers of non-woven fabric. Sedum and Sempervivum can therefore be left outdoors all year round without any shelter from the rain: they grow better in the cold than in the oppressive heat of summer!

Cacti that resist outdoors

Most cacti can handle the cold very well, even intense temperatures, i.e. with night-time lows around zero Celsius degrees (even a few degrees lower), as long as they are in a dry substrate from the end of September. Some genera are even more robust and can be kept outdoors all year round, in some cases even in damp soil (but avoiding the stagnation that can be created with excessively peaty substrates or, worse, leaving the plants resting on saucers).

Among the most resistant cactaceae are undoubtedly almost all Echinopsis, which are often left on balconies and terraces with the only precaution of sheltering them from the rain (although these plants are often able to survive even in damp soil). Almost all Opuntias are very robust and, like the Agaves, in some areas (Southern Italy, the Ligurian Riviera, the French Riviera) grow in the open ground without any problem. Tephrocactus, Chilean plants that have some affinities with Opuntia, also tolerate the cold well and can spend the winter outdoors, as long as they are sheltered from the rain. However, a spray from time to time during the winter months is useful for these cacti, which if kept dry for months easily lose their “cladodes” (the new parts of the stem). Within the Tephrocactus genus, however, it is useful to keep the geometricus species sheltered, which is very “in fashion” in recent years: the cold and humidity easily cause stains on the stem of this cactus.

Other genera of cacti accustomed to spending long periods in intense cold are the Pediocactus and the Escobaria (almost all species). These are not very widespread genera but are ideal for those who want to grow cacti without having to move them in the winter months. Pediocactus and some species of Escobaria (for example E. vivipara) can tolerate temperatures several degrees below zero even in damp soil. For years I have kept some specimens of Pediocactus (simpsonii and knowltonii) and some Escobaria vivipara outside the greenhouse all year round, letting them get the rain even in winter: they have always resisted and flowered regularly.

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Correlated articles

• Where to keep succulents in winter?
• Succulents and cold: minimum temperatures
• Seasonal care for cacti and succulents
• Be careful of winter blooms

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L'articolo Succulents outdoor all year? Here are the ones that resist and the story of my “resurrected” Echinocereus proviene da Il fiore tra le spine.

The following article is dedicated to this theme, which goes into detail about the cleaning and sterilization of vases (plastic and terracotta) and the materials used for the substrates (pumice, lapillus, gravel, etc.) which have been set aside after the last repottings carried out in recent months. (…)

Premise

The recycle of pots and aggregates is common practice. Obviously it is not always possible to recycle everything, but a good part of what has been used for the cultivation of our plants can easily be used for future repotting, as long as the materials are thoroughly cleaned and sterilized. Clearly, broken pots and peat must be eliminated since they have exhausted their “cycle” (the peat has already been exploited and would be of little use), but the first major distinction to make is whether those materials (pots and substrates) have given hospitality to plants in perfect health or if they have hosted plants that have died from rot or are otherwise affected by parasites. Let’s see everything in detail by dividing the two categories: vases and inert materials.

Recycle pots

Recycling pots, especially if you use plastic ones, is a must. First of all, we contribute (in our own small way, clearly) to the reduction of plastic production; secondly, you save money, because plastic vases are very long-lasting and can be washed extremely easily. If you use terracotta vases, recycling also takes on an additional value: you can reuse particular vases, perhaps “valuable” or in any case large and therefore expensive.

 PLASTIC POTS  – If no plant has died in the pot, you can limit yourself to a thorough washing with warm water and a detergent product. Even in these cases, however, adding a little bleach is always useful to eliminate germs and bacteria that may have formed while the vases were stacked waiting to be recycled. For washing, all you need is a sponge with a slightly abrasive side and a little bit of patience. Important: if you use bleach you should wear rubber gloves, the classic gloves for household work!

However, if a plant had died in the pot, you can decide to throw away the old container to eliminate the risk that the new “tenant” could contract the same fungus, or carry out a more in-depth operation. In this second case, rinse the vases well, then place them in a basin containing water and bleach and leave them to soak for a few hours (even a whole night if you want). After this period of time, wash the vases carefully, trying to reach every internal corner, with a slightly abrasive sponge, always with water and bleach. At the end, wash a second time with soap and water and rinse thoroughly. Once the vases are clean it is advisable to leave them in direct sun for at least a day: even intense sun helps to sterilize.

 TERRACOTTA VASES  – Unlike plastic vases, terracotta ones are porous: this is why cleaning is longer and more difficult, since an old terracotta vase may have limescale or greenish stains. If the vase is already clean enough, you can wash it carefully with soap and water and a drop of bleach. If, however, the vase is marked by limescale stains or moss residues, it can be immersed in a basin with water to which we add lemon juice, or bicarbonate or vinegar. We leave the vases to soak for a few hours and give them a vigorous wipe with a sponge, using the same water in which they were soaked. Once the “signs of old age” have been removed, proceed by washing the vase with water and soap and then placing it in direct sunlight for at least a day, to ensure that all the water evaporates from the porous walls.

If a plant has died from rot in the terracotta pot, there are two cases: if the pot is already old, chipped or of negligible value, it can be thrown away. However, if the vase is valuable, large or has a certain value, it can be cleaned thoroughly and then sterilized. The cleaning procedure is the same as described above, while as regards sterilization you can use the old boiling method (obviously if the jar is not huge): you place it in a cooking pot, fill everything with water and turn on the heat, leaving the vessel to “cook” until it boils. Once the water boils, turn it off and leave the jar to soak for at least twenty minutes. Alternatively, you can immerse the terracotta pots in water, adding an “aggressive” sanitizing solution, such as bleach (leaving them to soak for at least an hour). Once the vase has been cleaned and sterilized, it is placed in direct sunlight for at least a day, so that it can dry completely.

The procedures described above are applicable, up to a certain point, also to enamelled pots usually used for bonsai. In this case, they are usually valuable vases, enamelled on the outside and porous on the inside: all the more reason it is a shame to throw them away. A word of caution when dealing with this type of vase: in these cases it is best to avoid boiling (which could ruin the enamel), preferring bathing in water and bleach. Likewise, it is better to avoid abrasive sponges that could scratch or ruin the enamel.

The choice of vase? Here’s everything you need to know…

Recycle inert

In the cultivation of succulent plants, whether cacti or leafy succulents, many inert materials are used, i.e. materials useful for draining the substrate. The aggregates can be porous or smooth, each one has certain properties and the choice is truly remarkable and it is good to know them to choose the most suitable ones for the mix we want to create. In this article you will find an examination of most of the materials useful for preparing soil for succulents. Having said this, when you dig up the plants and thoroughly clean the roots you will find yourself with entire basins full of the old substrate, which, if done correctly, contains a lot of inert materials. Unlike peat, which becomes depleted over time and with the absorption of nutrients by the plant, aggregates retain their usefulness and this is why (as well as saving money) it is certainly a good thing to recycle them.

As with pots, however, it is important to point out that the substrate in which a plant has died or in which parasites have been found (for example, root cochineal) must be eliminated. The pots, as we have seen, can be washed and sterilized, but in the case of the substrate it is better not to take unnecessary risks: if a plant has rotted in that soil or if we have found parasites in that soil, we throw it away without hesitation.

If, however, the substrate has been recovered from the repotting of perfectly healthy plants (it is essential to carefully check that no parasites nest among the roots) we will be able to recycle it without problems. The first thing to do, once all the old substrate has been collected in buckets or basins, is to sift it, using a fine mesh sieve, so as to separate the actual aggregates from the peat, dust or clay. The fine part, now used, must be eliminated, while the aggregates are deposited in a clean container. Once all the aggregates have been obtained, we move on to sterilization, which is useful even if no plant has died in that substrate.

To sterilize inert materials there are different methods: for example, they can be spread on a cloth and sprayed with a non-aggressive disinfectant (let’s avoid bleach) then letting everything evaporate, or they can be boiled, exactly like terracotta vases. Finally, they can simply be spread out on a nylon sheet and left in direct sunlight for at least a week, allowing the sunlight and air to give a good cleaning to pumice, lapillus, gravel, quartzite, etc. In essence, the sterilization process of the aggregates is mild and rapid since if there were no parasites or bacteria present in the substrate that caused the plant to rot, it can simply be deduced that that soil was and is perfectly “healthy”.

Once the cleaning and sterilization operation has been completed, the aggregates can be put aside or used immediately for the composition of a new substrate, adding fresh peat, earthworm humus or any other element useful to the plant that will be repotted (for example chalk for some cactus genera).

Important note: when taking the plants out of the pot it is essential to thoroughly check their health and check that no parasites are nesting among the roots (here you can find a video on root mealybug). Only in this way can we have reasonable certainty that those aggregates can be recycled without problems. When in doubt, it’s better to throw everything away: it would be a shame to put the plants at risk just to save a handful of pumice or lapillus!

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Correlated articles

• Diseases and pests: all the articles
• Choose the right pot
• Substrates: all the articles
• Inert and materials
• Repotting: all the articles

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L'articolo Pots and inert in the cultivation of succulents: can we recycle them or is it better to throw everything away? proviene da Il fiore tra le spine.

Even a young bat, entangled, poor him, among the deadly hooked thorns of an Ancistrocactus and died in that unwelcome embrace during the night, without my being able to notice it or do anything to free it. In many years of cultivation this has also happened to me as you will see in the photo in the article. Those who grow cacti, especially if they have a greenhouse (although singular encounters can also be had when growing them in a garden, on a terrace or on a balcony) know well that not only insects, but also many reptiles or small mammals usually slip through one plant and another. Lizards, spiders, ants, snails, mantises, small birds and mice (not so much the small ones, the so-called field mice, but the real rats, which devour any plant, thorns or no thorns) abound especially if you grow in countryside, where it is not uncommon to come across some harmless water snakes. They are abundant, in particular, if you prefer spartan cultivation, with reduced use of chemical products. Most of these “guests” do not cause any harm to the plants; still others are useful in the fight against parasites: think of ladybugs or of that little red spider visible to the naked eye that goes for a walk on the stems of cacti and which at first glance causes a stroke, but is actually a useful predator of the very harmful red spider, invisible to the naked eye (unlike the damage it causes to plants).

In this article here is an overview of the encounters with animals or insects that I have had in years of cultivation, both on a small balcony and in the current large greenhouse in the countryside. Above all, here is some useful information to understand which animals or insects are “friends” and which animals or insects are “enemy” and how to keep them at bay. (…)

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L'articolo Reptiles, rodents, insects: how many encounters while growing succulents! Here are the ones to avoid proviene da Il fiore tra le spine.

With the beginning of autumn almost all succulent and cacti begin to prepare for the vegetative stasis which will last until February/March. In the winter months, cacti (with some exceptions such as Melocactus, Discocactus and epiphytes such as Epiphyllum) and many succulents (with the exception of those originating from the southern hemisphere or areas such as Madagascar) stop growth and go dormant to recover energies and be able to flourish during the following season. In these months the plants should be kept cold and should not be watered. However, it is useful to carry out some preventive treatments to prevent the formation of mold or fungi during these months, thanks to the winter humidity, which, when the temperature start to rise, triggers rot. Warning: preventive treatments with chemical products can be useful but do not necessarily have to be carried out. It is simply a preventive measure, since the best form of defense is always the spartan cultivation of plants accompanied by a good exchange of air during autumn and winter. There are growers who limit these treatments to the essentials, perhaps favoring products with a low environmental impact (I myself have adopted this decision for years) and growers who abuse chemical products in the hope of thus making their plants invulnerable to animal parasites, fungi and mold.

In this article, which completes what has already been explained in other articles (which you will find thanks to the internal links) we see what is advisable to do in these weeks to protect the plants and limit losses due to rot or parasites as much as possible. (…)

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L'articolo Here comes autumn: what treatments can we do to protect succulents and reduce losses? proviene da Il fiore tra le spine.

A practical handbook and an in-depth analysis on a much debated topic among those who grow succulent and/or cactus plants. Here’s what you’ll find by reading this article, designed specifically to help those who, with the first drops in temperatures, are starting to wonder where to place their succulents when the real cold arrives. Unless you have a greenhouse, perhaps equipped with a burner regulated by a thermostat, the question is in fact more than pertinent: during the winter it is better to keep the succulent plants outside (sheltered from the rain), or in a cool environment such as a landing, an internal staircase or even a garage? Or should we bring all the plants indoors? It is good to clarify immediately that the answer to these questions cannot be tranchant or “absolute”: obviously the correct winter location depends on many factors, starting from the area in which the plants are grown (North or South Italy? North or South Europe? Sea or high mountains?) to arrive at the type of plant (Cactaceae, succulent native to Africa or Madagascar? Sempervivum, Crassula, Euphorbia?). In short, the range of cases is very broad and as always there are no absolute rules. Luckily there are many fixed points and many precautions that should be respected to ensure that our succulents pass the winter securely and take advantage of the vegetative stasis to be able to flower again the following year.

The following article answers these questions, and you will also find an indication of the correct measures to be taken to ensure that cacti and succulents overwinter in the best possible way, have abundant blooms and, above all, you’ll find a practical handbook with an indication of the best location for cacti and succulents organized in alphabetical order, so as to facilitate the identification of the plant, understand in which minimum temperature range it can stay and where it can be placed (for example outside, on a landing, or directly inside the house). (…)

Premise

Succulent plants, whether Cactaceae or succulent plants belonging to other families such as Crassulaceae, Asclepiadaceae, Euphorbiaceae, etc., are not houseplants. They can certainly adapt to home cultivation, but they are plants that require light, air and which find their best location in outdoor environments such as windowsills, terraces, gardens or open greenhouses. This, of course, in the growing season which generally runs from March to October. The problem, and therefore the focus of this article, is winter, also because not everyone has the possibility of having a greenhouse or a garden. Given the slight drop in temperatures in recent days, questions are growing regarding how to behave in view of the cold weather in the coming months. As always, given that succulents are a varied world, made up of thousands of botanical species, unfortunately there is no single answer. However, there are parameters and references on which we can rely to give the correct answer to the question regarding wintering. These parameters are essentially the guides underlying the handbook that you will find at the end of the article.

Attention: this article is designed specifically for those who are not yet very familiar with these plants and need practical information and quick answers: for example, I have this succulent, where can I place it when it gets cold? For more specific insights and tables with the minimum temperatures that succulents can reach, it is possible to refer to two other articles published in the past. The first article, accompanied by a table with minimum temperatures, can be found at this link. The second article, which deals with seasonal care in detail, can be reached via this link.

Cacti

Let’s begin to distinguish between Cactaceae and succulent plants in general. The distinction is not intended to complicate the matter, but rather to simplify it to more quickly identify the correct solution to the initial question: where to place the plants during the winter? If you want to learn more about the difference between a cactus and any other succulent (for example Euphorbia, Echeveria, Lithops), you will find this article helpful.

Almost all cacti tolerate low temperatures very well. By low temperatures we mean minimums close to zero Celsius degrees or even well below this value. The cacti can therefore also be placed outside as long as watering is completely suspended at the end of September and they are positioned in a cold place sheltered from the rain. These are also the essential conditions for the plants to flower from the following spring. Therefore, a terrace, a balcony or a garden are fine. The important thing is that the cacti do not take on water until the end of March and the temperatures do not fall below zero Celsius degrees for several consecutive nights. In the event of frost or prolonged nights with temperatures well below zero, it is advisable to move the plants to a less cold place, even if only temporarily. A useful precaution is to cover the cacti with at least two or three layers of non-woven fabric: naturally it doesn’t work miracles, but two or three degrees more ensures them and, above all, allows transpiration, preventing condensation from forming on the plants or a humid environment is created, which is very dangerous for these plants as it favors the formation of stains on the stem, mold and fungi. On sunny winter days it is useful to raise the tissue even for a couple of hours to ensure the plants have a good exchange of air. It is best to avoid small greenhouses closed by thick sheets of transparent plastic, unless you always leave them open during daylight hours.

An exception to this basic rule are some genera of cacti, which do not tolerate the cold and should therefore be kept indoors or in environments where temperatures do not fall below certain limits (for example an internal staircase, a landing or even a garage). In these cases it is not necessary for the plants to receive a lot of light because if we suspend watering the cacti go into stasis and stop growing. This avoids the risk of “etiolation”, i.e. the so-called “spinning” which disfigures the plant from an aesthetic point of view. Attention: however, if we see excessive wrinkling of the stem or branches of these cacti, particularly if they are wintering indoors, it is advisable to water in moderation, at most once a month. The cacti that do not tolerate the cold are those originating from tropical areas and forests: firstly the epiphytic cacti (Schlumbergera, but also Epiphyllum, Rhipsalis, Aporocactus); secondly, two species native to Brazil and the Cuban archipelago: Melocactus and Discocactus. All these plants must winter at minimum temperatures no lower than 12/14 Celsius degrees (Melocactus and Discocactus require even higher minimum temperatures, between 16-18 Celsius degrees): you will find all the indications and the reference to the genus in the handbook accompanying this article.

Succulent

In theory, for succulents the matter becomes a little more complicated. This is because the Cactaceae is a single family that is divided into genera, species and subspecies. Succulents, on the other hand, are distributed in various families which are in turn divided into genera, species and subspecies. The number of these plants is therefore very high and providing specific indications plant by plant is almost impossible. However, even in this case it is sufficient to set a few “boundaries” to make the matter less complicated. The first element to consider is the place of origin of the plant: many succulents come from Africa or Madagascar (for example Euphorbia and Lithops). Clearly these plants require higher minimum temperatures and cultivation at home or in an environment where the minimum temperatures do not drop below 10/12 Celsius degrees is ideal. Other families or genera, for example Agave, Sempervivum and Sedum, tolerate intense cold very well, in many cases even well below freezing.

Even with succulents it is advisable to suspend or at least reduce watering during the winter months, whether they are in a cold environment or in an apartment. During the winter months, in fact, almost all plants slow down in growth and frequent watering would only expose the specimen to the risk of root rot. Generally speaking, you can adjust as follows: from the end of October to the end of March, succulents should be placed in environments sheltered from rain and at temperatures between 7 and 16 Celsius degrees. There are many exceptions, such as the aforementioned Agave, Sempervivum and Sedum, which we can keep outdoors even without protection and letting them take the rain (as long as it is not torrential and lasts for whole days). Other plants, such as some species of Euphorbia, Echeveria, Lithops (the so-called “stone plants”), tolerate the cold well but must be kept dry and at temperatures between 2 and 7 Celsius degrees. Other plants native to Africa or Madagascar, such as Adenium obesum (called “Desert Rose”), Pachypodium (the so-called “Madagascar Palm”), Uncarina and several species of Euphorbia require several degrees more because they do not tolerate the cold: all these plants will therefore have to be brought indoors from at least mid-October, unless autumn is mild and the minimum temperatures remain high even in this period, as happens in the regions of Southern Italy, Southern France or in Spain.

The handbook that completes this article will also be useful to orient you between the needs of the various succulents.

The handbook

The handbook (actually the handbooks, since one is dedicated to cacti and the other to succulents). It is intended to be a useful tool for the still inexperienced grower or for the expert grower who is approaching a particular genre for the first time. Naturally, the handbook should be considered as a tool, a sort of “map” through which to orient yourself and should not be understood as an “absolute” compendium with dogmas or strict rules, also because the temperatures indicated have been “rounded” a little upwards precisely with the aim of not putting your plants at risk (for example if the range between 5 and 10 degrees is indicated, it is very likely that the plants included in this range can tolerate even a few degrees less). Many growers have conducted experiments discovering that certain plants can resist temperatures lower than what is commonly thought, just as others have found that plants considered rustic were not able to survive the winter (in these cases, however, it is more likely that unpredictable factors have occurred, such as frequent frosts or that the specimen itself was already weak or not in perfect shape).

How to read the handbook

The handbook – both for cacti and succulents – is designed for quick and easy consultation. The three icons consider three possible environments for the wintering of plants:

1. the outside: the plants should be placed outside the house but sheltered from the rain and, for caution, protected by a few layers of non-woven fabric;
2. environments protected from rain but without heating, such as a landing, an internal stairwell, a room in the house where the radiator has been closed. For succulents that fall into this “category”, at most, even a very sheltered corner of a balcony can be fine, as long as the plants are covered by at least four layers of non-woven fabric;
3. the apartment: warm environment (generally between 18 and 20 Celsius degrees) and obviously protected from rain. In this case it is best to place the plants near a window and away from heat sources.

Each icon is color coded and genres are listed alphabetically. It is sufficient to scroll through the downloadable handbooks below, identify the genre whose needs we want to know and look at the color of the line in which the genre is written: depending on the color we then refer to the icon.

Download the handbook on winter placement of cacti

Download the handbook on winter placement of succulents

 CULTIVATION CARDS  – To further deepen your knowledge of a single genus of cactus or succulent, remember that in the website shop, at this link, detailed sheets are available in downloadable and printable PDF format with notions, anecdotes, curiosities and precise cultivation instructions. You can find the cards simply by scrolling through the shop, after the section dedicated to subscriptions.

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Correlated articles

Succulents and cold: a table with reference values
Seasonal care for cacti and succulents
How to grow cacti: the handbook

© The texts, videos, photos and graphic elaborations of the site “Il fiore tra le spine” are original material and are covered by copyright. It’s forbidden to reproduce them in any way.

L'articolo Where to keep succulents in winter? Outside, on a landing or in the house? A practical handbook proviene da Il fiore tra le spine.

Let’s go against the trend, since the period is more suitable for talking about suspending watering than about how, how much, when a cactus or succulent plant is watered. The topic, however, is of primary importance and although already covered in a specific article published in the “early days” of this site, it deserves further study. And it deserves it, perhaps even more so, now that we are approaching the moment when (at least in Northern Italy and in Europe) it is appropriate to suspend irrigation. Knowing when to say stop wetting cacti and succulent plants in general is essential to avoid rot during the winter. Knowing in which ways it is possible to water our plants (from above, like rain, or from below, or wetting only the soil, etc.), knowing how many times to water them during the growing season, how to adjust with the various genres, how to relate watering to the substrates used and much more is equally fundamental.

This is therefore the reason for this article, which also answers the many questions on this topic – how are succulent watered, how often are they watered, in which way? etc. – placed at any time of the year by novice growers (and not only novice). Not to mention that, if we want to go into detail, there are cacti and succulents that really appreciate some winter watering. Didn’t you know? More and more this article will be for you.

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L'articolo From above, from below, only the soil: how cacti and succulents get wet and how long we can do it proviene da Il fiore tra le spine.