Sempervivum calcareum

A houseleek from the limestone mountains of the south-western Alps, forming blue-green rosettes with sharp reddish-purple tips. It is fully frost hardy and wants full sun, sharp drainage and a cold winter; it is a plant for an outdoor rockery or trough rather than a windowsill.

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

Grows on limestone rock, screes and stony slopes in open, sunny mountain sites, as the epithet suggests.

Recorded from about 80 to 2,085 m, median about 1,330 m; low records may be garden escapes or valley populations.

FranceItaly

🔒 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 2.5 licence, unmodified.