Sempervivum grandiflorum

A large-flowered, sticky-haired houseleek of the western Alps (Piedmont, Aosta Valley and the Swiss Valais and Ticino), mostly at 1,500-2,500 m. It is fully hardy and needs a real cold, snow-covered winter, a cool bright summer and sharp drainage; it does poorly as a warm indoor plant.

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

Rock crevices, screes and dry stony grassland, usually on siliceous rock, in the subalpine and alpine zones.

Recorded from 70 to 2,966 m, median about 1,790 m; low records are probably strays or garden escapes.

ItalySwitzerland

🔒 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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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 3.0 licence, unmodified.