Spiraea japonica Magnum Rose ('Brolanspi'PBR)

RHS Plant Profile
Japanese spiraea [Magnum Rose]

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Synonyms

Spiraea japonica 'Brolanspi'PBR

Plants for pollinators
Shrubs

Bushy, deciduous shrub about 2m tall, with sharply-toothed green leaves tinted red in spring, becoming green in summer, then yellow in autumn. Produces bowl-shaped, bright pink flowers in flattened heads during summer that become paler as the season progresses

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1-1.5 metres

Size

Time to Maturity
5–10 years
Max Spread
1-1.5 metres
Max Height
1.5-2.5 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
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
Trade

How to Grow

Cultivation

Grow in moist but well-drained soil in full sun or light shade, ideal for large 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

  • Coastal
  • Cottage and informal garden
  • Wildlife gardens
  • Flower borders and beds
  • Hedging and screens

Pruning

Pruning group 6 for spiraea flowering on current years stems, deadhead after flowering. Keep neat and compact by cutting all stems back to within 30cm of ground level

Pests

Generally pest-free

Diseases

Generally disease-free but may be susceptible to powdery mildews