species
Sempervivum arachnoideum
Cobweb houseleek
Scale drawing from this record, beside a 1.7 m figure.
Sempervivum arachnoideum is a perennial in the family Crassulaceae, also known as Cobweb houseleek, introduced to the UK. It reaches 8 cm tall and 15 cm across in about 10 years. It grows in full sun, on sand or loam soil, where the ground is acid or neutral and in well drained conditions, and suits average or exposed positions. It flowers in July and is evergreen. Its RHS hardiness rating is H6 (hardy, very cold winter): −20 to −15°C.
Assembled from the attributes recorded below.
What this plant needs
- Size at maturity
- 8 cm tall × 15 cm across, after about 10 years
- Hardiness
- H6 (RHS)
- Lifecycle
- Perennial
- Aspect
- Full sun
- Soil
- Sand, Loam
- Acidity
- Acid, Neutral
- Moisture
- Well drained
- Exposure
- Average, Exposed
- In the UK
- Introduced
When it flowers
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Evergreen — it holds its leaves through the winter.
Plan a bed with Sempervivum arachnoideum
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