group that includes dozens of evergreen succulent plants originating in Europe, America and Asia. They appear as dense rosettes of fleshy leaves, mostly rounded, sometimes elongated, of various colors, from light green to green-blue, up to black-purple. Some varieties are covered with a soft down, which is often present on the edge of the leaves of many varieties. The rosettes tend to form large cushions, producing new plants at the end of long stolons, which tend to root singularly as they grow. Plants of at least three years of age produce a raceme of small starry flowers, at the apex of a long fleshy stem. After flowering, many plants produce fertile seeds, and then die.
Display: the sempervivum need very bright positions, even when exposed to the direct rays of the sun; they also grow well in partial shade or in full shade. They do not fear the cold, they are more likely to fear excessive heat, but it depends very much on the species. They can be colitvare in the garden, in full ground, or in containers, which it is preferable to leave outdoors throughout the year.
Watering: to have a healthy plant it 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 possibility to dry completely between one watering and another, avoiding soak the substrate; provide fertilizer for succulent plants every 15-20 days during the growing season.
Cobwebs - Sempervivum arachnoideum: Useful info
Multiplication: can take place by seed, using fresh seeds in autumn. Usually sempervivums are propagated by removing the new plants and growing them in individual containers.
Pests and malttie: these plants are very resistant, but sometimes they can be attacked by aphids and, if grown outdoors, by snails. If kept in high humidity conditions they can be affected by root rot.