Spiraea japonica 'Genpei'

RHS Plant Profile

Japanese spiraea 'Genpei'

Synonyms

Spiraea japonica 'Shirobana' misapplied
Spiraea japonica 'Shibori' misapplied

Shrubs

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Dwarf, deciduous rounded shrub about 45cm in height and spread, with lance-shaped, sharply-toothed dark green leaves and producing a mix of deep pink and white flowers separately or in the same flowerheads on the one plant, during summer

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: South–facing or West–facing or East–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: Accepted

How to Grow

Cultivation

Grow in moist but well-drained soil in full sun or light shade. Especially suitable for mixed borders, container cultivation and border edging or low hedging

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
Patio and container plants
Wildlife gardens
Flower borders and beds

Pruning

Pruning group 6 for spiraea flowering on current years stems, deadhead and clip over to keep neat, after flowering.

Pests

Generally pest-free

Diseases

Generally disease-free but may be susceptible to honey fungus