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Spiraea thunbergii
  • RHS AGM

Thunberg spiraea

S. thunbergii is a dense twiggy medium-sized deciduous shrub with narrow light green leaves to 4cm in length. White flowers 6mm in width are borne in abundant small clusters in spring and early summer

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Size
Ultimate height
1–1.5 metres
Time to ultimate height
10–20 years
Ultimate spread
1–1.5 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Moist but well–drained, Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring White Green
Summer White Green
Autumn
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 the UK
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

Easy to grow in most moist soils, tolerant of all but the most extreme conditions. Especially suitable for mixed borders

Propagation

Propagate by softwood cuttings in summer

Suggested planting locations and garden types
  • Cottage and informal garden
  • Low Maintenance
  • Banks and slopes
  • 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

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