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Shrubs

Clethra delavayi Franch.

A large deciduous shrub to 4m tall, with arching shoots and blue-green leaves to 15cm long. Dense, horizontally held spikes of cup-shaped, fragrant white flowers are produced in midsummer

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Ultimate height

2.5–4 metres

Time to ultimate height

10–20 years

Ultimate spread

2.5–4 metres

Clay

Loam

Sand

Moisture

Moist but well–drained

pH

Acid

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Partial shade

Aspect

East–facing or North–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: Clethraceae
Native to the UK: No
Foliage: Deciduous
Habit: Bushy
Genus: Clethra can be deciduous or evergreen trees or shrubs, sometimes with attractive bark, with simple leaves and small, fragrant, usually white, bell-shaped flowers in racemes or panicles
Name status: Correct
Plant range: W. China

How to grow

Cultivation

Grow in fertile, humus-rich, moist but well-drained acidic soil in partial or dappled shade; a woodland garden is ideal

Propagation

Propagate by sowing seed in containers outdoors in spring or autumn. Take greenwood cuttings in early summer

Suggested planting locations and garden types

Flower borders and beds

Pruning

See pruning group 1

Pests

Generally pest-free

Diseases

Generally disease-free

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