Onosma alborosea
An evergreen, clump-forming perennial up to 25cm in height with oblong or lance-shaped white bristled grey-green, leaves. In summer, bears bunches of tubular white flowers, turning to pink and purple as they mature, atop short stems
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Size
Ultimate height
0.1–0.5 metresTime to ultimate height
2–5 yearsUltimate spread
0.1–0.5 metresGrowing conditions
Moisture
Well–drainedpH
Alkaline, Neutral, AcidColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | White Grey Silver Green | |||
|---|---|---|---|---|
| Summer | White Pink Purple | White Grey Silver Green | ||
| Autumn | White Grey Silver Green | |||
| Winter | White Grey Silver Green |
Position
- Full sun
Aspect
South–facing or West–facing
Exposure
Exposed or ShelteredDrought resistance
Yes Hardiness
H5Botanical details
- Family
- Boraginaceae
- Native to GB / Ireland
- No
- Foliage
- Evergreen
- Habit
- Clump forming
- Genus
A genus of rosette-forming flowering perennials, native to the dry, rocky areas of the Mediterranean and western Asia. Often grown as rock plants, they have narrow, green hairy foliage. Short stems carry long, pendant, tubular pink, yellow, red or white flowers
- Name status
Unresolved
How to grow
Cultivation
Plant sideways in a wall, or in a scree bed, well-drained trough or rock crevice. Avoid winter wet. Alternatively, grow in an unheated greenhouse in a gritty compost mix of loam, leaf mould and grit. Avoid watering the foliage
Propagation
Propagate by seed in autumn, in a cold frame or sheltered position outside
Suggested planting locations and garden types
- City and courtyard gardens
- Cottage and informal garden
- Rock garden
- Gravel garden
Pruning
No pruning required
Pests
May be susceptible to aphids or glasshouse whitefly under glass
Diseases
Generally disease-free
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