a group that includes dozens of evergreen succulent plants from Europe, America and Asia. They appear as dense rosettes of fleshy leaves, mostly rounded, sometimes elongated, of various colors, from light green to blue-green, up to black-purple. Some varieties are covered by a soft down, which is often present on the margins of the leaves of many varieties. The rosettes tend to form wide cushions, producing new plants at the end of long stolons, which, growing up, tend to root singly.
Plants at least three years old produce a raceme of small star-shaped flowers, at the apex of a long fleshy stem. After flowering many plants produce fertile seeds, and then die.
Exposure: sempervivums need very bright positions, even when exposed to direct sunlight; they vegetate well even in half shade or full shade. They do not fear the cold, it is more likely that they fear the excessive heat, but it depends very much on the species. They can be cultivated in the garden, in the ground, or in containers, which is preferable to leave outdoors throughout the year.
Watering: to get a healthy plant is good to water regularly in the period from March to October, almost never in the winter months, the important thing is that the soil has the ability to dry up completely between one watering and the other, avoiding soaking the substrate; provide fertilizer for greasy plants every 15-20 days in the growing season.
CRASSULACEAESEMPERVIVUM ARACHNOIDEUM L.Herbaceous plant, stoloniferous. Leaves of the cobweb rosettes for long, interwoven white hairs. Upright stems, 5 – 20 cm high, with corymbs of porphyry flowers…. Knowing the meaning and language of flowers is of fundamental importance in order not to make bad figures and never to make mistakes in every occasion.
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Sempervivum arachnoideum: Useful info
Multiplication: can be done by seed, using fresh seeds in autumn. Usually the sempervivums are propagated by detaching the new plants and cultivating them in single containers.
Parasites and diseases: these plants are very resistive, but sometimes they can be attacked by aphids and, if grown outdoors, by snails. If they are kept in high humidity conditions they can be affected by root rot.