Sempervivum calcareum 'Guillaumes'
houseleek 'Guillaumes'
An evergreen perennial producing rosettes, averaging 2cm in diameter, made up of spirally arranged, fleshy, green leaves suffused dark red starting at the tip and spreading down the leaf as it ages. The flowers are pale green and sticky, produced in clusters on long, stout stems in summer
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Size
Ultimate height
Up to 10cmTime to ultimate height
5–10 yearsUltimate spread
0.1–0.5 metresGrowing conditions
Moisture
Well–drainedpH
Acid, Alkaline, NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Red Green | |||
|---|---|---|---|---|
| Summer | Green | Red Green | ||
| Autumn | Red Green | |||
| Winter | Red Green |
Position
- Full sun
Aspect
North–facing or East–facing or South–facing or West–facing
Exposure
Exposed or Sheltered Hardiness
H5Botanical details
- Family
- Crassulaceae
- Native to the UK
- No
- Foliage
- Evergreen
- Habit
- Matforming
- Genus
Sempervivum are evergreen perennials forming mats of fleshy-leaved rosettes, often attractively coloured, with star-shaped pink or pale yellow flowers in summer
- Name status
Accepted
How to grow
Cultivation
Grow in moderately fertile well-drained soil in full sun. Protect from excessive winter wet. Suitable for rock garden, scree bed, wall crevice, trough or alpine house
Propagation
Propagate by rooting offsets in spring
Suggested planting locations and garden types
- City and courtyard gardens
- Coastal
- Cottage and informal garden
- Gravel garden
- Rock garden
- Patio and container plants
- Garden edging
Pruning
Carefully remove spent rosettes after flowering
Pests
May be damaged by sempervivum leaf miner, slugs and snails, and vine weevil larvae
Diseases
May be affected by a rust
Get involved
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.