Sempervivum leucanthum

A Balkan houseleek of mountain rocks in Bulgaria and northern Greece, with yellowish-white flowers. It is fully frost hardy and wants full sun, sharp drainage and a cold winter 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

Grows on rocky slopes, screes and cliff ledges in the mountains, mostly on siliceous rock, like other Balkan Sempervivum.

Measured sites at about 750–2,100 m, with most records from high in the Pirin–Rhodope area.

BulgariaGreeceNW. Balkan Pen.

🔒 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.