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Shrubs

Caryopteris incana 'Delft Blue'

bluebeard 'Delft Blue'

A dense, mound-forming deciduous shrub to 1m, with ovate, toothed, grey-green leaves to 7cm long. In late summer and early autumn it bears small, blue flowers in clusters along the stems

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

1–1.5 metres

Chalk

Loam

Sand

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

East–facing or South–facing or West–facing

Exposure

Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Lamiaceae
Native to the UK: No
Foliage: Deciduous
Habit: Bushy
Genus: Caryopteris can be deciduous shrubs or perennials, with aromatic, simple leaves and small blue or white flowers in compact axillary clusters in late summer and autumn
Name status: Unresolved

How to grow

Cultivation

Grow in moderately fertile, light, well-drained soil in full sun

Propagation

Propagate by seed sown in a cold frame in autumn; root softwood cuttings in late spring or greenwood cuttings in early summer

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Wildlife gardens
Low Maintenance
Banks and slopes
Flower borders and beds

Pruning

See pruning group 6

Pests

May be susceptible to capsid bugs

Diseases

May be susceptible to honey fungus

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