Sempervivum giuseppii

A cobwebbed houseleek from the Cantabrian Mountains of northwest Spain, considered a natural hybrid between Sempervivum arachnoideum and S. cantabricum. It is a fully hardy alpine rosette plant that wants hard light, sharp drainage and a genuinely cold winter rest; 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

Grows on exposed rock ledges, screes and thin stony soil in the high Cantabrian range, where it sits under snow or frost through winter and in strong sun and wind in summer.

Wild records span about 630–2,500 m with a median near 2,100 m; the 630 m point is a Madrid record that is almost certainly a cultivated plant.

Spain

🔒 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

Sempervivum tectorum Sempervivum ciliosum Sempervivum calcareum Sempervivum arachnoideum Sempervivum marmoreum Sempervivum pittonii Sempervivum altum Sempervivum macedonicum Sempervivum alatum Sempervivum annae Sempervivum armenum Sempervivum artvinense All 65 →

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.