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Ribes sanguineum 'Koja' (Flowering currant 'Koja' )

Beginner
skill rating
1 hour care
per year
1.5m
Max height
1.5m
Max spread
5-10 years
To maturity

Plant details

Botanical name

Ribes sanguineum 'Koja'

Other names

Flowering currant 'Koja'

Genus

Ribes Ribes

Variety or Cultivar

'Koja' _ 'Koja' is an upright, deciduous shrub with green leaves and large, drooping clusters of crimson flowers in spring, followed by blue-black berries in summer.


Ribes sanguineum 'Koja' is: Deciduous

Fragrance

Foliage is aromatic.

Habit

Bushy

Flower

Deep-pink in Spring

Foliage

Green in Spring; Green in Summer

How to care

Watch out for

Specific pests

Aphids Aphids

Leaf spot Leaf spot

General care

Propagation methods

Hardwood cuttings


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Where to grow

Ribes sanguineum 'Koja' (Flowering currant 'Koja' ) will reach a height of 1.5m and a spread of 1.5m after 5-10 years.

Suggested uses

Cottage/Informal, Hedging/Screens, Low Maintenance

Cultivation

Easy to grow in most soils. Best in a sunny or partially shaded position.

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)

Companion plants

We do not currently have companion plants added for this plant.

Botanical name

Ribes sanguineum 'Koja'

Other names

Flowering currant 'Koja'

Genus

Ribes Ribes

Variety or Cultivar

'Koja' _ 'Koja' is an upright, deciduous shrub with green leaves and large, drooping clusters of crimson flowers in spring, followed by blue-black berries in summer.

Foliage

Deciduous

Fragrance

Foliage is aromatic.

Habit

Bushy


Colour

Flower

Deep-pink in Spring

Foliage

Green in Spring; Green in Summer


How to care

Watch out for

Specific pests

Aphids

Specific diseases

Leaf spot

General care

Propagation methods

Hardwood cuttings


Monthly care advice


Where to grow

Ribes sanguineum 'Koja' (Flowering currant 'Koja' ) will reach a height of 1.5m and a spread of 1.5m after 5-10 years.

Suggested uses

Cottage/Informal, Hedging/Screens, Low Maintenance

Cultivation

Easy to grow in most soils. Best in a sunny or partially shaded position.

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 8, Zone 7, Zone 6

Defra's Risk register #1

Plant name

Ribes sanguineum 'Koja' (Flowering currant 'Koja' )

Common pest name

Japanese fruit scale; Mulberry scale; White peach scale

Scientific pest name

Pseudaulacaspis pentagona

Type

Insect

Current status in UK

Absent

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

4

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

3

General biosecurity comments

Scale insect which in favourable conditions may kill trees. There have been a number of findings in the UK but some uncertainty about whether the pest is established. Stakeholder organisations may wish to monitory for its presence.

Defra's Risk register #2

Plant name

Ribes sanguineum 'Koja' (Flowering currant 'Koja' )

Common pest name

Black ring of tomato; Bouquet of potato; Pseudo-aucuba of potato; Ringspot of bean; Ringspot of beet; Ringspot of lettuce; Yellow vein of celery

Scientific pest name

Tomato black ring virus

Type

Virus or Viroid

Current status in UK

Present (Limited)

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

1

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

3

General biosecurity comments

Vector present in the UK and the pest is present with a limited distribution. Current mitigations are effective at reducing the risk of spread.

Defra's Risk register #3

Plant name

Ribes sanguineum 'Koja' (Flowering currant 'Koja' )

Common pest name

Latent ringspot of strawberry

Scientific pest name

Strawberry latent ringspot virus

Type

Virus or Viroid

Current status in UK

Present (Limited)

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

1

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

3

General biosecurity comments

Present in the UK; risk of spread is effectively mitigated by current regulation and industry certification scheme. To be considered as part of EFSA Annex IIAII review.

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

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This is a fast growing shrub compared to the other shrubs that I planted on the same day (31/03/2012) (20/09/2012)

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This plant likes... Garden match
Soil types: Chalky, Clay, Loamy, Sandy (will tolerate most soil types) Tell us...
Soil drainage: Moist but well-drained, Well-drained Tell us...
Soil pH: Acid, Alkaline, Neutral Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: North, South, East, West Tell us...
Exposure: Exposed, Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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