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How to Grow and Care for a Cobweb Houseleek (Sempervivum arachnoideum)

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Sempervivum arachnoideum, sometimes known as Cobweb Houseleek is a species of flowering plant in the family Crassulaceae, native to the Alps, Apennines and Carpathians.

It is a low-growing, evergreen, perennial succulent, forming a mat of fleshy rosettes up to 1.2 inch (3 cm) in diameter. Leaves are green or reddish, with cobwebby white hairs at the tips. Starry pink flowers are up to 0.4 inch (1 cm) in width in flat cymes on stems up to 5 inches (12.5 cm).

Growing Conditions

Light: Full sun to light shade
Hardiness Zones: 5a – 8b
Soil: Sempervivum arachnoideum, as with most succulents, need excellent drainage. Poor, sandy soil would be just fine. You could work some peat into heavier soil, to lighten them and improve drainage.
Water: Regular in growing season, very little in winter.

Propagation

Propagate by seed sown in spring, or root offsets in spring.

Grow Sempervivum arachnoideum

Photo via blog.libero.it

General Care

Relatively easy to grow in container or in rock garden, scree bed, wall crevice, trough or alpine house. After the plant blooms and sets seed it will die, but there will be many offsets to take its place. Plant in well drained succulent soil mix in full sun to light shade. Water regularly during the growing season and allow soil to dry out before watering again. Water very little during the winter months.

Pests and Problems

Sempervivum arachnoideum can get vine weevil and may be subject to a rust.

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