Kerria japonica (Japanese rose)

Botanical name

Kerria japonica

Other names

Japanese rose, Jew's mallow

Genus

Kerria Kerria

Species

K. japonica - K. japonica is a suckering, rhizomatous, deciduous shrub with ovate, pointed, toothed, bright green leaves and single or double, golden yellow flowers in spring.

Native to

China, Japan

Foliage

Deciduous

Habit

Suckering

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Colour

Flower

Golden-yellow in Spring

Foliage

Bright-green in Spring; Bright-green in Summer; Bright-green in Autumn

General care

Pruning

Pruning group 3. Remove suckers as needed in autumn or winter.

Propagation methods

Division, Semi-hardwood cuttings, Softwood cuttings

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Monthly care advice

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Where to grow

Kerria japonica (Japanese rose) will reach a height of 2m and a spread of 2.5m after 5-10 years.

Suggested uses

Low Maintenance, Woodland

Cultivation

Plant in fertile, well-drained soil in sun or part shade. Tolerates a wide range of conditions. Site carefully as thickets may become invasive.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Exposed, Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4)

USDA zones

Zone 9, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4

Defra's Risk register #1

Plant name

Kerria japonica (Japanese rose)

Common pest name

grape ground pearl

Scientific pest name

Margarodes vitis

Type

Insect

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

2

Impact (1 is very low - 5 is very high)

5

General biosecurity comments

Main pathway; Vitis spp. plants for planting; already prohibited. However; further consideration of other pathways is required.

Defra's Risk register #2

Plant name

Kerria japonica (Japanese rose)

Common pest name

Lance nematode; Nematode; Lance

Scientific pest name

Hoplolaimus spp.

Type

Nematode

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

2

Impact (1 is very low - 5 is very high)

4

General biosecurity comments

Nematode species potentially affecting a wide variety of crops; prohibition of soil likely to mitigate risk substantially; keep under review in light of interceptions or findings should they occur in the EU.

Defra's Risk register #3

Plant name

Kerria japonica (Japanese rose)

Common pest name

Scientific pest name

Orgyia thyellina

Type

Insect

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

3

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

Polyphagous moth pest from Eastern Asia which could be damaging to broadleaf and coniferous species if introduced to the UK; as well as having human health impacts. The main pathway is likely to be on goods (including non-plant material) imported from Eastern Asia and awareness raising with the main industry sectors is recommended.

About this section

Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.

Traveling or importing plants? Please read "Don't risk it" advice here

Suspected outbreak? Click here for contact details to report to the relevant authority.

Date updated: 7^th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/