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ShrubsAlpine Rockery
Lithodora zahnii
Zahn's gromwell
An upright, many-branched, evergreen shrub, to 30cm tall, with narrow, leathery, dark grey-green leaves. Small terminal clusters of blue or white flowers are produced all summer and sporadically in autumn
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Size
Ultimate height
0.1–0.5 metresTime to ultimate height
5–10 yearsUltimate spread
0.1–0.5 metresGrowing conditions
Chalk
Loam
Sand
Moisture
Well–drainedpH
Alkaline, NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Green Grey Silver | |||
|---|---|---|---|---|
| Summer | Blue White | Green Grey Silver | ||
| Autumn | Blue White | Green Grey Silver | ||
| Winter | Green Grey Silver |
Position
- Full sun
Aspect
West–facing or South–facing
Exposure
Exposed Hardiness
H4Botanical details
- Family
- Boraginaceae
- Native to the UK
- No
- Foliage
- Evergreen
- Habit
- Bushy
- Name status
Correct
- Plant range
- S Greece
How to grow
Cultivation
Grow in well-drained, preferably alkaline to neutral soil in full sun
Propagation
Propagate by semi-ripe cuttings in summer
Suggested planting locations and garden types
- Rock garden
- City and courtyard gardens
- Coastal
- Cottage and informal garden
- Gravel garden
- Patio and container plants
- Banks and slopes
- Flower borders and beds
Pruning
Pruning group 8; or pruning group 10 after flowering
Pests
Generally pest-free
Diseases
May be susceptible to honey fungus in gardens where it is present but insufficient data to determine degree of susceptibility
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