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Marl as a substrate for cacti: is it really so good? How to use it and with which plants does it work

The use of marl as a substrate component for the cacti’s cultivation has been widespread for years, especially in Italy. Thanks to the studies and research conducted by my friend Andrea Cattabriga – grower, researcher and succulent expert at the international level. But what are we talking about, when we discuss marl? Quite simply, a greyish and highly friable rock, to the point of breaking up into flakes until it becomes powder. It’s used to create substrates for the cultivation of many cacti and some succulent plants when combined in some dosages with other materials such as quartzite, pumice, sand, gravel, lapilli, peat, field soil (clay).

In this article we explore the benefits of using marl in cactus cultivation, we see how to make a valid marl-based substrate, and we try to understand, above all, with which kinds of cacti this material can work and with which ones it should be avoided. (…)

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Lophophora williamsii, the sacred cactus illegal in some states: let’s get to know the infamous Peyote

Yes, it can be grown but not sold… no, it cannot be cultivated nor sold… Yes and no at the same time: only young specimens can be raised because, after seven or eight years, the plant produces the notorious mescaline, and it becomes illegal (therefore, it must be incinerated???). Yes, you can keep it, but only if purchased before 2006, because it’s from that year that the plant was included in the “Testo Unico sulle Droghe” (Law-framework on drugs). In Italy and in many other European countries, about the cultivation of Lophophora williamsii (a Cactaceae also known as “peyote” or “peyotl”), people have been said everything and its opposite. This is because in Italy and in some other European countries, the possession and the sale of this cactus have been the subject of normative interventions, but, as it often happens, laws are muddled, lacunose, obscure and, from a logical point of view, sometimes not very coherent. For example: in the tables attached to the Italian law on drugs, it is mentioned only Lophophora williamsii, when cactus experts know very well that of Lophophora, besides williamsii, there are several other species: decipiens, diffusa, fricii, koehresii, alberto-vojtechii.

In this article, relying on official sources, we will know better this particular kind of cactus and see in detail what the Italian law exactly says. Please remember that this plant is illegal in Italy as well as in other states, so you better check the legislation of your country to avoid taking risks! (…)

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Growing cacti and succulents: seasonal care and what needs to be done during the year

I have discussed in various articles on this site of the basic factors for growing cacti and succulents, particularly those collected in the Cultivation category. This post intends to be a kind of summary “map” organized by seasons (seasonal care), indicating what you have to do at each time of year. In the following article, I review everything that needs to be done in terms of watering, fertilizing, repotting, exposure, etc. – season by season, to best grow cacti and succulent plants in general. This guide is thought to be a practical “vademecum” at a glance (but each topic can be explored in depth thanks to the appropriate internal links) of what is useful and recommended to do in spring, summer, fall and winter.

In short, a kind of handbook to keep in mind every time to organize work, whether you have a greenhouse or a terrace, a balcony or even only a windowsill. Let’s see everything in this article. (…)

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How to make cactus and succulent plants bloom: what you need to know and what tricks to use

How to get cactus to bloom is one of the most frequently asked questions among succulent plant enthusiasts. Here are the precautions to take to make our cacti flourish.

Colourful, flashy, ephemeral. Cactus blooms are sudden bursts of energy. Often the buds develop in a few days to open within few hours, amazing the newcomers to the cultivation of these plants and, above all, those who are not familiar with succulents. In these last few years, I have noticed that there is a lot of misinformation about cacti, in particular about their blooms. Those who do not cultivate these plants can even be surprised that they can bloom, no more or less than the specimens of all the other plant families, forgetting that the flower is the basis of the reproduction of almost all plants. Others are impressed to learn that even cacti can bloom in abundance and several times during the growing season, thinking perhaps that the flowering of a cactus is an exceptional event, almost unique. Nothing could be more wrong: all the cacti regularly bloom, and if there are relatively stingy species, that can produce few flowers for limited periods during the year, there are also really generous species, able to give blooms several times for entire months (for example Echinopsis, Astrophytum, Strombocactus, Gymnocalycium, Trichocereus).

In the following article we see in detail how to make cacti and succulent plants bloom abundantly. (…)

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Summer is coming: seasonal care for cacti and succulents, watering and aestivation

Summer is a relatively quiet season for those who grow cacti. Things to do, in fact, are not that many. Preventive treatments have already been done, and repotting, although repotting can be done at any time if necessary, should be suspended at this time, when the plants are in vegetation and in full bloom. Fertilizations should also be stopped at this time, confining them to spring and September. Overall, the bulk of the work in the weeks from mid-June through August focuses on watering, which will need to be calibrated according to the species being grown. In some cases, with certain plants, it will be appropriate to suspend them altogether to avoid stagnation and rot. Indeed, there are plants that vegetate well even in these months and plants that slow down their vegetation. Still others, in the warmer months, such as July and August, stop vegetation altogether to resume growth at the time of September, as soon as the maximum temperatures have dropped slightly. This phenomenon, the halting of vegetation coinciding with the hottest weeks, is called “summering,” and it is good to know its effects to avoid risks in cultivation.

In the following article we look in detail at what we have to do in the run-up to summer to best prepare cacti and succulents and avoid problems. (…)

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Il fiore tra le spine

Due o tre cose che ho imparato su cactus e piante grasse

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