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ShrubsAlpine Rockery

Lithodora zahnii

Zahn's gromwell

L. zahnii is 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 metres
Time to ultimate height
5–10 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Well–drained
pH
Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
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
H4
Botanical details
Family
Boraginaceae
Native to the UK
No
Foliage
Evergreen
Habit
Bushy
Name status

Correct

Plant range
S Greece

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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

Generally disease free

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