Ilex crenata 'Dark Green' (Japanese holly 'Dark Green')

Botanical name

Ilex crenata 'Dark Green'

Other names

Japanese holly 'Dark Green', Box-leaf holly 'Dark Green', Box-leaved holly 'Dark Green', Ilex crenata 'Icoprins11'

Genus

Ilex Ilex

Variety or Cultivar

'Dark Green' _ 'Dark Green' is a dense, bushy, evergreen shrub with tiny, broadly ovate to rounded, glossy, dark green leaves and insignificant flowers in spring and summer, sometimes followed by glossy, black fruit.

Foliage

Evergreen

Habit

Bushy, Dense

Toxicity

Berries may cause discomfort if ingested.

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Colour

Flower

White in Spring; White in Summer

Foliage

Dark-green in All seasons

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How to care

Watch out for

Specific pests

Aphids , Leaf-mining sawflies , Scale insects

Specific diseases

Holly leaf blight

General care

Pruning

Pruning group 1 or trim informal hedges in early spring. Trim formal hedges in late summer. Pruning will encourage a flush of young, yellow-green leaves.

Propagation methods

Seed, Semi-hardwood cuttings

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Monthly care advice

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Where to grow

Ilex crenata 'Dark Green' (Japanese holly 'Dark Green') will reach a height of 4m and a spread of 3m after 20-50 years.

Suggested uses

Low Maintenance, Hedging/Screens, Ground Cover, Cottage/Informal, Architectural, Resistant to pollution

Cultivation

Grow in well-drained soil in sun. Planting is best done in late winter or early spring.

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

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

Defra's Risk register #1

Plant name

Ilex crenata 'Dark Green' (Japanese holly 'Dark Green')

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 #2

Plant name

Ilex crenata 'Dark Green' (Japanese holly 'Dark Green')

Common pest name

pink wax scale; red was scale; ruby wax scale

Scientific pest name

Ceroplastes rubens

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

Based on its biology and low potential impact continued action on this pest in the UK would not be considered appropriate. It is likely to be of more concern to southern Member States of the EU; as it is an economic pest of citrus.

Defra's Risk register #3

Plant name

Ilex crenata 'Dark Green' (Japanese holly 'Dark Green')

Common pest name

Stubby-root nematode

Scientific pest name

Trichodorus cedarus

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)

3

General biosecurity comments

Polyphagous nematode pest from Asia; occasionally intercepted by the UK. Causes direct feeding damage on plant roots and has the potential to vector viruses.

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/