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Spots on the stem and rot, here’s what you can do to save sick succulents and cacti

Circumscribed dark spots, yellowish spots, dryness, discoloration of the stems, reddening, small cuts: over time, signs of various kinds and of varying size may appear on the stem of our cacti. In some cases there is nothing to worry about, because they are small wounds caused for example by the thorns of a nearby plant, or because they are simply the signs resulting from the aging of the plant. In other cases, however, it is necessary to intervene immediately, because that spot is perhaps due to some fungal pathology destined to expand until it seriously disfigures or kills the plant. But how to distinguish a harmless thorn prick scar, for example, from dangerous rot? How to understand if that discoloration of the stem is caused by the sudden exposure of the plant to direct sun or by a lack of nutrients, or by the beginning of a fungal attack? And how to intervene to contain the damage or save the plant when the damage has already been confirmed?

This is what we will see in this article, with the help of a series of photographs that portray different situations and different pathologies. Some photos were taken by readers of Il fiore tra le spine and portray their plants: I thank these readers for agreeing to share their photos with me, thus collaborating in the creation of the following article. (…)

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The Asclepiadaceae family: African succulents with beautiful but… smelly flowers

Although more than twenty years have passed, I still remember my first encounter with an Asclepiadaceae. A few years ago, I approached the world of succulents, and I went to visit a nursery just outside my city. I had been browsing among the succulents for quite a while when the owner of the nursery, an elderly but very chirpy lady, noticed me and my interests in plants, approached me and said: “Do you want to see a succulent plant with beautiful flowers?” I said yes, of course, I wanted to see it, so she took me down a narrow corridor cluttered with plants and pointed to a large succulent in a hanging pot. It had thick fleshy, straight green stems with reddish edges, and from one of these stems hung a big star-shaped flower with elongated, thin tips and shaded yellow petals crossed by tiny dark streaks. “Come closer, sniff how good it smells”, the lady said to me, passing from a restrained smile to an open, fat laugh, as soon as I obeyed and immediately withdrew, disgusted by the smell of rotting flesh that from that flower had entered right into my nose.

Keep on reading the article if you want to know how this story goes (…)

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Two useful products for keeping succulents healthy: Neem oil and copper oxychloride

Many cactus and succulent enthusiasts are convinced that the cultivation of these plants necessarily involves the use of chemical products against diseases and parasites. Others consider the use of these products simply as a component of cultivation to be used in certain cases; still others are not too subtle and at the cost of having healthy plants are willing to destroy their lungs, massacre bees and poison the environment. Talking to them is as useful as trying to convince an agoraphobic to take a walk in a desert. But these people, after all, grow for collection and not for love of Nature or a sincere passion for plants. This article, the result of my personal experience and therefore not to be considered as a “lesson” in an absolute sense, may be useful to everyone else. The experience has led me to drastically reduce the use of so-called “phytopharmaceuticals” or “phytosanitary products” (which do not include fertilizers), especially toxic and synthetic ones. I have undertaken this path for some years now for reasons of health protection (mine first and foremost) and the surrounding environment, considering that many pesticides have, among the various side effects, that of killing bees. The issue relating to the death of bees may seem of little importance to the uninformed, but in reality it has enormous importance on a global level from an environmental point of view.

Let’s see in this article how it is possible to reduce the use of pesticides and fungicides, limit ourselves to products with low environmental impact such as Neem oil and copper oxychloride and still have strong and healthy cacti and succulents. (…)

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How a cactus changes depending on the type of cultivation: the difference made by soil and exposure

When they say that a picture is better than words. In this case, there are three photos, but the concept doesn’t change, and the difference between a cactus grown in a “natural” (or “wild”) way and one with a “garden-style”, based on basic notions and beliefs is quite evident. The plants I’m writing about are Ferocactus latispinus obtained from a 2012 sowing of mine. From that same planting, I’ve got at least forty plants. Over the years, I have given away some of them, but most are still with me and are growing beautifully. It’s important to point out that these are plants born from seeds contained in a single fruit (gift of a dear friend), sown the same day and grown over the years in the same conditions, i.e. in my greenhouse, in standard soil (pumice, lapilli and peat in equal parts), watered and fertilized with the same frequency. This is to say that the starting conditions, including the genetics and the grower’s hand, are the same. And yet, as you can see from the photo above, where the three plants (three at random of the twenty-five or so that I have kept for myself) are side by side, they show remarkable differences, at least to the discerning eye and the grower with a minimum of experience.

So let’s see, in this article, how and why different cultivation regimens, assumed as a whole and not just limited to the soil, affect so much the final result and really make the difference between a cactus grown and cultivated in any garden or generic nursery and a cactus grown by an enthusiast or an expert. (…)

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Lithops: peculiarities and cultivation rules of the so-called “stone plants” or “living stones”

Also known as “stone plants” or “living stones”, Lithops are a genus of succulents that are always highly appreciated and widespread in cultivation and in collections. These are actually small plants, very particular, aesthetically pleasing and available in an infinite variety of colors and shades. Speaking of Lithops, one thing must be clarified immediately: they are non-cacti succulents. In other words, these plants do not belong to the large Cactaceae family (which includes cacti), but to the Mesembryanthemaceae family. In reality, according to many authors, to date the Mesembryanthemaceae family does not even exist anymore and the genera once attributable to it must be included in the Aizoaceae family. This vast family of succulent plants includes many other genera often widespread in cultivation or in nature also in Europe, such as Carpobrotus, Conophytum, Delosperma, Faucaria, Fenestraria, Lapidaria , Oscularia, Pleiospilos, Titanopsis and Trichodiadema.

Let’s deepen our knowledge of the Lithops genus in this article, in which we will also see the particular cultivation regime that these plants need in order to live in the Northern hemisphere. (…)

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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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