Six identical cacti in three different soils: a cultivation test with Mammillaria hahniana

Here is another test of mine. In the cultivation of cacti, a bit like with many other passions in life, there are two different approaches: a “static” approach, let’s say “contemplative” and “collecting”, and a “dynamic” one, experimental and inspired by an ever greater understanding of these plants. In this second approach (which is the one that has inspired my passion for years) the study of reliable texts, the comparison with other growers and, above all, the experimentation in the field, for example, working on potting media, exposure, cultivation techniques and more, are fundamental. Just growing plants – succulent or not – for years and years, in the same way, never changing the type of soil, exposure or method of cultivation is fine, mind you. Clearly, it’s perfect for those who only appreciate plants from an aesthetic or collecting point of view and have no particular demands. In short, it’s valid for those who are not interested in learning more and are not willing to take risks to improve and better understand the plants themselves.

Instead, the aim of “wild” cultivation is to obtain specimens as robust as possible, and with the same look to those that grow in the habitat (I write about this cultivation’s philosophy here). In addition to the documentation and possibly travel to observe the plants in nature, it is essential to engage in some experiments and be willing to question continuously, even if it could lose some specimens (not the valuable ones, of course). (…)

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Spartan cultivation in full sun, and the results can be seen: healthy plants and robust thorns

Temperatures are still above the seasonal averages, but summer has faded and autumn is on its way. Like every year, at the end of September I started preparing my greenhouse for the cold months. Nothing major, just some cleaning work, moving plants from outside to inside, a check on the heating system and two coats of copper oxychloride on plants a preventive measure. The plants themselves will do the rest, dehydrating following the suspension of watering from mid-September (from now on I will water just a few leafy succulents and, sporadically, Copiapoa and Eriosyce until the end of October) and starting to produce their natural “antifreeze” within the plant tissue of stems.

This is a good time to check the state of health of the plants and, in my case, to “draw some sums” on the results of the Spartan cultivation to which I subjected several specimens, as I explain in the following article. (…)

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Targeted repotting: sowing identical plants in different soils to test the substrate

It’s time for… testing. Between the end of December and the end of February, as soon as I have time, I dedicate myself to repotting the plants in the greenhouse. Obviously I only repot plants in stasis, with very dry soil, postponing the change of pot to spring for the plants that I keep in vegetation in winter, perhaps outdoors (but still in pots and not in the ground, of course). Today I flared and planted about fifty plants that I obtained by sowing in natural light and heat. Some of them were born in 2014, others in 2016 (but already large enough to be repotted). It was an opportunity to start a useful test on various types of soil to understand how this affects the growth of some specific species of cacti.

Let’s see in the following article what exactly this experiment on the substrate consists of and let’s see, thanks to the photographic update two years after repotting, how the plants have grown. (…)

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