Sempervivum guillemotii

A Pyrenean houseleek usually treated as a form of the common Sempervivum tectorum, making tight rosettes on sunny rock and scree in the mountains. It is a fully hardy alpine that wants full sun, sharp drainage and a real 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

Sunny rock ledges, screes and dry grassy slopes in the Pyrenees, like other tectorum forms.

Climate sites lie at about 350-2,170 m, mostly 1,500-2,200 m; only eight records carry an elevation (median about 1,620 m).

SpainFranceAndorraSwitzerlandGermany

🔒 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.