Sempervivum (Hauswurz)

Origin

The genusSempervivum, known in German as Hauswurz, belongs to the Crassulaceae family. It comprises around 40–50 recognized species, which are originally distributed in the mountainous regions of Europe, Asia Minor and North Africa. The name "Sempervivum" means "always alive" and refers to their great robustness. Traditionally, houseleeks were used as medicinal plants, for example for skin problems or insect bites.

Appearance

Sempervivum species form dense rosettes with fleshy, pointed leaves, which often have a waxy surface. The color ranges from green to red and bronze tones to multicolored variants. In summer, older rosettes develop an inflorescence with star-shaped, mostly pink or reddish flowers. After flowering, the mother rosette dies off, but numerous offshoots ensure the permanent preservation of the plant.

Care

Location:Houseleeks need plenty of sun. A place outdoors, on rock gardens, on top of walls or in pots on balconies and terraces is ideal.
Substrate:Sempervivum prefer a very permeable, mineral substrate. A lean substrate with sand, gravel, or lava is optimal.
Irrigation:Watering is rarely necessary. Houseleeks are extremely drought-resistant and can survive with little water. Waterlogging must be avoided at all costs.
Fertilizer:Usually, no fertilizer is necessary. Soil that is too rich in nutrients tends to weaken the plants. If necessary, cactus fertilizer can be sparingly applied in spring.
Summer/Winter:All Sempervivum species are fully winter-hardy. They can remain outdoors all year round and survive frost without protection.

Popular species

Sempervivum tectorum:The classic houseleek with large, green rosettes, often with a reddish edge. Traditionally cultivated on house roofs.
Sempervivum arachnoideum:Also called spiderweb houseleek. Small rosettes with fine white threads between the leaves, reminiscent of spiderwebs.
Sempervivum calcareum:An attractive species with grey-green leaves and striking, dark red leaf tips. Particularly popular in rock gardens.

Note:Sempervivum are considered non-toxic to humans and animals and are therefore also suitable for households with pets.