Cryptomeria japonica 'Sekkan-sugi' (Japanese cedar 'Sekkan-sugi')

Botanical name

Cryptomeria japonica 'Sekkan-sugi'

Other names

Japanese cedar 'Sekkan-sugi'

Genus

Cryptomeria Cryptomeria

Variety or Cultivar

'Sekkan-sugi' _ 'Sekkan-sugi' is a moderately slow-growing, conical, evergreen, coniferous tree with soft, spirally-arranged, awl-shaped leaves, creamy yellow when young, dark green when mature, and bronze to yellow-greed in winter.

Foliage

Evergreen

Habit

Bushy, Compact

Toxicity

Handling may cause skin irritation or an allergic reaction.

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Colour

Flower

Insignificant or absent in All seasons

Foliage

Pale-yellow, Dark-green, Cream in Spring; Pale-yellow, Dark-green in Summer; Dark-green in Autumn; Yellow-green, Bronze-green in Winter

General care

Pruning

No pruning necessary. One of the few conifers that responds well to coppicing. Cut back untidy specimens to within 60-90cm of ground level in spring.

Propagation methods

Semi-hardwood cuttings

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Monthly care advice

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Where to grow

Cryptomeria japonica 'Sekkan-sugi' (Japanese cedar 'Sekkan-sugi') will reach a height of 10m and a spread of 8m after 20-50 Years.

Suggested uses

Architectural, City, Foliage only, Low Maintenance, Specimen tree

Cultivation

Grows best in deep, fertile, moist but well-drained soil in a sheltere, sunny or partially shaded site. Will tolerate most well-drained soils, including chalk.

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

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, Zone 5

Defra's Risk register #1

Plant name

Cryptomeria japonica 'Sekkan-sugi' (Japanese cedar 'Sekkan-sugi')

Common pest name

Cypress twig; borer

Scientific pest name

Argyresthia cupressella

Type

Insect

Current status in UK

Present (Widespread)

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

3

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

3

General biosecurity comments

Has spread following introduction; little evidence of significant damage. Stakeholder groups may wish to monitor.

Defra's Risk register #2

Plant name

Cryptomeria japonica 'Sekkan-sugi' (Japanese cedar 'Sekkan-sugi')

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/