Sempervivum arachnoideum
Cobweb Houseleek
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Cobweb Houseleek (Sempervivum arachnoideum) - Description
Sempervivum arachnoideum, sometimes known as cobweb houseleek, is a species of flowering plant in the family Crassulaceae, native to the Alps, Apennines and Carpathians. Growing to 8 cm (3 in) tall by 30 cm (12 in) wide, it is a rosette-forming succulent perennial, valued in cultivation for its ability to colonise hot, dry areas via offsets.
Cobweb Houseleek (Sempervivum arachnoideum) - Blooming
In summer, the full-grown rosettes (hens) produce a loose panicle of small pink, purplish, or white star-shaped flowers somewhat resembling daisies. The hens die after flowering.
Cobweb Houseleek (Sempervivum arachnoideum) - Growth
Rosette-forming perennials with succulent, evergreen leaves. They spread slowly to form low, dense mats by producing new offsets at the end of runners. Does best in full sun.
Cobweb Houseleek (Sempervivum arachnoideum) - Planting
Divide clumps or pick off individual "chicks" and plant them anytime during the primary growing season (spring and early summer). Sow seeds in an area that is protected from the cold. Do this in the spring.
Cobweb Houseleek (Sempervivum arachnoideum) - Pest
Prone to Endophyllum rust.
Cobweb Houseleek (Sempervivum arachnoideum) - Interesting facts
Members of the genus Sempervivum are often times covered with a web of hairs, or trichomes, which form a mat over the plant. These mats of hairs are mostly white, which provides a reflective barrier that prevents excessive absorption of solar radiation. If the plant absorbs too much light it can overheat and as a result will suffer. The mats of hairs also provide a boundary of air around the surface of the plants which can decrease the rate of water loss from the plants. The genus Sempervivum is in the family Crassulaceae. This family is known to have a special type of metabolism that combats excess water loss. The webs of hairs are another anatomical feature used to prevent high rates of water loss.
Cobweb Houseleek (Sempervivum arachnoideum) - Soil and irrigation
Poor to average, well-drained soil. Drought tolerant.
