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Shrubs

Kerria japonica 'Simplex'

Japanese rose 'Simplex'

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

Synonyms

Kerria japonica misapplied single

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Ultimate height

1.5–2.5 metres

Time to ultimate height

5–10 years

Ultimate spread

1.5–2.5 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Acid, Neutral, Alkaline

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

South–facing or West–facing or North–facing or East–facing

Exposure

Exposed or Sheltered

Drought resistance

Yes

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: 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)

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