Piante grasse cactus spine

Tag: cultivation

Cacti and diseases: stop anxiety, sometimes we can’t help but let Nature take its course

Let’s talk about cacti and diseases starting from a simple photo. The plant that inspired this article, and which you see above, is (or rather, was) an Ancistrocactus (=Glandulicactus) mathssonii. I had obtained this specimen with my sowing about ten years ago and fortunately eight or nine other “brothers” of this plant are still in perfect health, growing and flowering regularly. This particular plant, although treated exactly like the other specimens of that sowing and planted in the same type of substrate in which my other mathssonii live (clay, marl and 60% aggregates), a couple of years ago took a fungal pathology and within a few weeks it was dead. I think it was fusarium, but today it doesn’t matter, because the disease has run its course and what remains is… the armor of this cactus, that is a beautiful interweaving of thorns that embraces the void left by the stem which, over time, it dried up until it decomposed and disappeared altogether. The observation of what remains of this plant, which for a couple of years I have kept along a low wall not far from the greenhouse, where I usually move the diseased plants (by diseases, in this case, I mean generically pathogens and parasites) to prevent them from infecting other specimens, led me to some considerations on the cultivation and treatment of plant diseases.

Considerations that I have condensed in the following article an excerpt of which was also published in the British Cactus and Succulent Society newsletter. (…)

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Preparing cacti and succulents for spring: exposure, fertilizing, here’s what to do

Bright blooms, fleshy and brand-new leaves, sparkling spines sprouting from the vegetative apices: for succulent plants, spring represents a real rebirth. Here in Europe, the vegetative stasis that characterizes the winter of most succulent families ends between the second half of February and the beginning of March, when the plants gradually resume vegetation and reactivate the root system. For some families, the restart is evident: this is the case of Cactaceae, which already in February show new spines and often the first flower buds (genera such as Stenocactus, many species of Turbinicarpus, some Mammillaria, etc.). Also, leafy succulents such as Crassula, Echeveria, Portulacaria, Aloe, Adenium are well-known for producing new shoots, new branches and leaves. For other species as the Agavaceae family, the recovery is less evident: it slowly forms fresh sprouts at the centre of the apical rose, destined to be noticed only in a few months, when the separation of the true leaves will take place. Whether the recovery is sudden and flashy or slow and hidden, in March it’s essential to devote some extra care to succulents: in this way, it will be possible to obtain healthy and robust plants that show their full potential development and flowering.

Now let’s see everything we can do at this time of the year, especially if we don’t have a greenhouse and we grow on the windowsill, on the balcony, on a terrace or in the garden. With a warning: whatever you have to do, with succulents and cacti, you must not be in a hurry: hurry to water, hurry to treat, hurry to move the plants… Getting caught up in the rush, the anxiety, the fear of doing something wrong, is the best way to run into mistakes. So let’s see how to avoid them. (…)

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Spontaneous sowing: when cacti do everything by themselves, just like in Nature

Why damn yourself with sterilized soil, perfectly clean pots, fungicide, transparent bags and so on, when you can let our plants do everything related to sowing? Exactly as it happens in Nature, in short. Jokes aside, those who have many plants know well that finding themselves with perfectly formed seedlings inside the pots, next to the mother plants, is far from rare. Generally we notice it during repotting, when we can observe our succulents with particular attention, because the spontaneously born seedlings are small and tend to “camouflage” themselves with stones and aggregates in the substrate, or they are found so close to the stem of the mother plant to be invisible to a superficial look. Over the years, in the pots of my plants, I have often found germinated and autonomously grown seedlings, in particular of genera such as Astrophytum, Epithelantha, Thelocactus, Mammillaria. A couple of years ago I even found a small plant of Euphorbia obesa already well formed, grown among the pebbles outside the greenhouse, in the shade of a large pot containing an Agave. Today the Euphorbia is in a 5 centimeters pot inside the greenhouse and continues to grow regularly. I had to reluctantly remove it from the outside and place it in a pot to prevent the cold and damp winter in North Italy from killing it, otherwise I would have gladly let it grow where it was born.

In these days, during the repotting of some Astrophytum capricorne of my sowing, I have found many seedlings and various seedlings born and grown independently in the pots of the mother plants (you can already see some of them in the cover photo, above). Hence the idea of ​​documenting and analyzing “spontaneous sowing” in the following article. (…)

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Plastic, terracotta, square or round? Here’s how to choose pots for cacti and succulents

Plastic or terracotta pots? Round, square, shallow or deep? And then again: is it better to have one plant per pot or several plants in one box or in a large bowl? At first glance, the subject may seem trivial, but the choice of the right vase for growing cacti and succulent plants has an undeniable impact on the consequence of the cultivation. The choice of the right pot, it can be said, is indeed closely related to the type of cultivation we adopt for our plants (indoors, on a balcony, in a greenhouse, in the open air, etc.) and to the various elements that characterize it, such as watering, type of substrate, exposure, temperature, and much more.

Net of purely aesthetic and therefore personal choices, let’s see how to choose the right containers for succulents’ cultivation, evaluating the pros and cons of the various shapes and materials with which the pots available on the market are made. (…)

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When to pricking out cactus seedlings, how to do it correctly, and what potting soil to use

Speaking of cactus sowings, a classic question, and one not infrequently asked with a fair amount of (unnecessary) apprehension, is: after how long should seedlings be repotted? In other words, when do the young seedlings need to be repotted and perhaps divided into individual pots? Again, as with many other “cactophilies matters”, the answer depends on various cultivation factors. Based on experience, however, it is possible to give general indications useful to those who experiment with sowing for the first time.

Let’s see in detail, in this article, everything we need to know about this fundamental step for the proper growth of plants from our sowing. (…)

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