Sempervivum calcareum 'Extra'
houseleek 'Extra'
A mat-forming succulent with symmetrical, many-leaved rosettes averaging 20cm in diameter, bluish green with dark red tips. The inflorescence is somewhat sticky, petals are white, flushed green at the tips and pink at the base, with reddish purple filaments
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 Pink White | Red Green | ||
| Autumn | Red Green | |||
| Winter | Red Green |
Position
- Full sun
Aspect
South–facing or North–facing or West–facing or East–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 seed sown in spring, or root offsets in spring
Suggested planting locations and garden types
- City and courtyard gardens
- Coastal
- Cottage and informal garden
- Gravel garden
- Patio and container plants
- Rock garden
- Garden edging
Pruning
No pruning required
Pests
May be susceptible to vine weevil
Diseases
May be affected by a rust
Get involved
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