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Shrubs

Spiraea formosana

Formosan spiraea

Upright, deciduous shrub about 1.2-1.5m tall, multi-branched, with brown stems, sharply toothed bright green leaves, yellow in autumn, and pinkish-white or white flowers in large terminal clusters on the current years growth, in early summer

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Ultimate height

1–1.5 metres

Time to ultimate height

5–10 years

Ultimate spread

1–1.5 metres

Clay

Loam

Sand

Chalk

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or South–facing or West–facing

Exposure

Exposed or 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: 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

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

Cottage and informal garden
Flower borders and beds

Pruning

Pruning group 6 for spiraea flowering on current years stems, deadhead and/or trim after flowering.

Pests

Generally pest-free

Diseases

Generally disease-free but may be susceptible to honey fungus

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