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Il fiore tra le spine

Month: January 2018

When and how fertilize cactus and succulent plants to have aboundant blooms

First of all: why should we fertilize our cacti and succulent plants? Let’s say right away that fertilization (or fertilisation, or manuring or mineral nutrition) is necessary for any plant grown in pots, since the amount of soil available is limited and, sooner or later, nutrients will begin to run low. Fertilizer nourishes the plant, enriching the soil of those elements which, through the time, are absorbed by the plant or washed away by the waterings.

Succulent plants should be regularly fertilized to ensure that the right quantity of nutrients is always available during the growing season. For cacti and succulents, however, generic fertilizers should not be used. In other words, a fertilizer commonly used for ornamental, leafy or fruit plants is not at all appropriate for a cactus plant. It is necessary to resort to specific fertilizers, specially balanced for the succulents. Otherwise, the risk is to irreparably compromise the growth and the physical appearance of the plant, making it weak and radically different from the specimens of the same species that grow in the wild.

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How much light do cactus need to grow well? The importance of sun and air and a summary table

Light is fundamental for every living being, starting with plants. This is obvious, but we cannot ignore it if we want to grow cacti and succulent plants in general. Plants, moreover, that often need many hours of light per day; in some cases direct or non-filtered light, in others not straight but equally intense daylight. In fact, there are succulent plants that, if placed in full sun, slow down growth, burn and even die. On the contrary, many succulent plants and many cacti, if they do not receive the right amount of direct light, will have stunted growth, with weak thorns and elongated stems.

In this article, we see what we need to know about the right exposure of cacti and succulent plants in general. Also, at the end of this article, you find a table summarizing the type of exposure needed by the main families of succulents.

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How often and how much to water cactus (cacti) and succulent plants and which water to use

Watering is still one of the most debated themes among those who approach the cultivation of cacti and succulents in general. How much water do cacti want? When should succulent plants be watered? How often should succulents be watered? These above are just some of the most frequent questions – and I fly over, for obvious reasons, on another question that I have often heard asked: But should cacti be watered…?

Like any living thing, succulent plants need water. How, how much and when water depends on many factors, such as the time of the year, the place where you live (North or South Italy, for example?), temperatures, environmental humidity, the substrates you use, the size of the pots, and more… Before going into the details of watering, let us sure to definitively put aside false convictions legacy of who knows what experiences at the edge of the absurd. For example, let’s get the fact that cacti and succulent plants have to be watered with droppers or watered once in a blue moon.

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How to repot cactus and succulent plants: in which period, how to proceed, which tricks to use

Some growers repot every year, while some others repot when required – i.e. when a plant shows signs of suffering or when the pot has become too small related to the stem. There can be many reasons for repotting (or racking, as someone says alternatively) a cactus or a succulent plant, and every grower has his own rules. As for me, I don’t have “fixed deadlines”: I evaluate plant by plant trying to understand if new soil and more space are needed. I repot my succulents when I see that the vase is now too small, when I believe that the soil has exploited or when I want to grow specific specimens more quickly. While it is true that many plants live quietly in the same container for five or six years (in many cases even longer!), it’s also true that frequent repottings (once a year or every two years) help to speed up the growth of cacti, particularly young plants and genera that over time take on considerable sizes, such as Echinocactus and Ferocactus.

I repot, also, when I notice that a plant has blocked for a long time and it doesn’t grow or produce new thorns. It can be the spy that something, at the root level, is going wrong. A plant that doesn’t grow or doesn’t swell despite watering, or, again, a plant that loses its colour (showing, for example, a lack of magnesium that not even fertilization can solve) can be saved by a repotting, with the cleaning of roots and the supply of new soil.

So let’s see in this article in which period it is better to repot cactus and succulent plants, which pots to choose (square, round, terracotta or plastic), how to check the roots and how to proceed in practice.

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