Kerria japonica 'Simplex'

RHS Plant Profile

Japanese rose 'Simplex'

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Synonyms

Kerria japonica misapplied single

Shrubs

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A vigorous suckering medium-sized deciduous shrub to 2m in height , with prominently veined, light green leaves and solitary bright yellow, single flowers from mid-spring

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity: 5–10 years
Max Spread: 1.5-2.5 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 Neutral or Alkaline

Position

Full sun Partial shade

Aspect: South–facing or West–facing or North–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): H5
Drought Resistance: Yes

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Rosaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Suckering, Bushy
Genus: Kerria are deciduous shrubs withgreen young shoots bearing simple, toothed leaves and rose-like, solitary 5-petalled flowers in mid-spring
Name Status: Unresolved

How to Grow

Cultivation

Grow in any well-drained or moist but well-drained soil in sun or partial shade. Good for woodland settings but may form large thickets and has the potential to become a nuisance if not managed well

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

Cottage and informal garden
Low Maintenance
Flower borders and beds
Hedging and screens

Pruning

Pruning group 3 and sucker removal if necessary in autumn or winter

Pests

Generally pest-free

Diseases

May be susceptible to honey fungus (rarely)