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Harmless💊 Medicinal

🌵 Common Houseleek

Sempervivum tectorum · Crassulaceae

🏔️ Mountains
🧠 To remember it“Houseleek on the roof keeps lightning away” — legend explains its old name, “Jupiter's beard” (Jove's beard), after the god of thunder.
Common Houseleek — Sempervivum tectorum

🔍 Identify it without mistakes

A succulent perennial forming compact, fleshy rosettes with thick, pointed leaves often tipped with red-brown, propagating via offset rosettes around the parent plant. A single flower stem, 20-50 cm high, appears only once every few years, bearing pink flowers in a cyme; the rosette dies after flowering.

  1. compact, fleshy rosette of pointed leaves
  2. multiplies through offset rosettes forming a ring around the mother plant
  3. grows on rocks, low walls, and historically on thatched or tiled roofs
  4. rarely produces a pink flower stem, only once every few years
Sizerosette 5-15 cm, flower stem 20-50 cm
FloweringJuly-August (rare, every 2-3 years per rosette)
Habitatrocks, stone walls, old roofs, and dry scree, from lowlands up to 2800 m in the mountains

💊 Healing with it

traditionally used externally to soothe mild burns, insect bites, and minor wounds (fresh pulp applied directly, much like aloe vera)

Level of evidence : traditional use — Traditional Alpine ethnobotanical literature

⚠️ traditional external use with no known toxicity; lacks robust modern clinical evaluation

🪓 Other bushcraft uses

  • traditionally planted on thatched roofs to symbolically protect against fire and lightning (Charlemagne reportedly ordered it to be grown on every roof in his empire)
Sources (2)

No entry replaces a certain identification in the field, or medical advice. When in doubt: don't eat it. If ingestion is suspected: poison control or 112/911.