Sempervivum arachnoideum

The cobweb houseleek is a small alpine rosette from the Alps, Pyrenees and Apennines whose leaf tips are linked by white, web-like hairs. It is fully frost-hardy and spreads by offsets. It needs full sun, a gritty mix and a cold winter, so it is best grown outdoors.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Dry airBand in Plantistry

Light Full sunDLI and PPFD in Plantistry

Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

It grows on sunny rock outcrops, scree, cliff ledges and thin, dry grassland in the mountains, usually on siliceous rock.

Mainly montane to alpine. The median record is about 1760 m, and records reach about 3050 m.

FranceSwitzerlandItalySpainAustriaGermanyCorsica

🔒 Growing it like that

The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:

✓ Day and night temperature targets, and the limits it tolerates

✓ Humidity band, and how to hold it

✓ Light as DLI and PPFD for a grow light

✓ Wet and dry seasons, and whether to rest it

✓ Substrate and airflow

✓ A step-by-step setup to grow it like the wild

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More Sempervivum

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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY-SA 4.0 licence, unmodified.