Cobweb houseleek
Sempervivum arachnoideum
Also called Cobweb sempervivum and Spiderweb hens and chicks
Houseplant · Succulents & cactiEach little rosette is laced across with white threads like a spider's web — the plant grows them, and they are thickest in full sun and dry air. Hardy to well below freezing; it is the damp that kills it, not the cold.
Care at a glance
- Ease
- Easy
- Water
- Every 20 daysSoak, then bone-dry — wait until the soil is dry right through — lift the pot, it tells you.
- Light
- Full sun
- Feed
- Every 90 days
- Humidity
- Low
- Hardiness
- Very hardy RHS H7, to -25°C
- Size
- 0.05 m tall · 0.3 m across
- Lifecycle
- Perennial
- Origin
- The Alps and Pyrenees
Is it safe for pets and people?
PetsNothing recorded against it
No animal-poison authority lists this plant either way.
PeopleNot checked yet
Nobody has checked this one against a source for us yet, so treat it as unknown rather than safe.
Checked against ASPCA and RHS on 2026-09-21. Where a source says nothing, we say nothing.
A guide, not veterinary or medical advice. If a pet or a person has eaten a plant and you are worried, call your vet or doctor now — don’t wait for signs to appear. Spotted a mistake? Tell us.