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Spiraea thunbergii

Thunberg spiraea

A dense, bushy deciduous shrub about 1.5m tall, with narrow light green leaves to 4cm in length. White flowers 6mm in width are borne in abundant small clusters along the branches, in early spring

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Size
Ultimate height
1–1.5 metres
Time to ultimate height
5–10 years
Ultimate spread
1–1.5 metres
Growing conditions
Chalk
Loam
Sand
Clay
Moisture
Moist but well–drained, Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring White Green
Summer Green
Autumn Green Yellow
Winter
Position
  • Full sun
  • Partial shade
Aspect

East–facing or South–facing or North–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H6
Botanical details
Family
Rosaceae
Native to GB / Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus

Spiraea are deciduous shrubs, sometimes suckering, with simple leaves and short racemes, panicles or corymbs of small, 5-petalled white or pink flowers in spring or summer

Name status

Correct

Plant range
China Japan

How to grow

Cultivation

Grow in moist but well-drained soil in full sun or light shade. Especially suitable for mixed borders

Propagation

Propagate by softwood or semi-ripe cuttings in spring to late summer or hardwood cuttings in winter

Suggested planting locations and garden types
  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Flower borders and beds
Pruning

Pruning group 2. If overgrown, can be renovated by cutting back hard immediately after flowering

Pests

Generally pest-free

Diseases

Generally disease-free but may be susceptible to honey fungus

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