Spiraea formosana

RHS Plant Profile
Formosan spiraea

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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

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand, Chalk

Max Height

1-1.5 metres

Max Spread

1-1.5 metres

Size

Time to Maturity
5–10 years
Max Spread
1-1.5 metres
Max Height
1-1.5 metres

Growing Conditions

Clay Loam Sand Chalk
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

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)
H6

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

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