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Zelkova serrata (Keaki)

Beginner
skill rating
1 hour care
per year
30m
Max height
18m
Max spread
10-20 years
To maturity

Plant details

Botanical name

Zelkova serrata

Other names

Keaki, Japanese zelkova, Saw-leaf zelkova, Keyaki

Genus

Zelkova Zelkova

Species

Z. serrata - Z. serrata is a spreading, vase-shaped, deciduous tree with smooth, exfoliating, grey bark, narrowly ovate to elliptic, toothed, dark green leaves turning yellow, orange, or red in autumn. Insignificant green flowers in spring are followed by small, wingless, green fruit.


Zelkova serrata is: Deciduous

Habit

Spreading

Awards

RHS AGM (Award of Garden Merit)

Flower

Insignificant or absent, Green in Spring

Foliage

Dark-green in Spring; Dark-green in Summer; Red, Yellow, Orange in Autumn

How to care

Watch out for

Dutch elm disease Dutch elm disease

General care

Pruning

Pruning group 1.

Propagation

Propagate by seed or grafting.

Propagation methods

Grafting, Softwood cuttings


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Where to grow

Zelkova serrata (Keaki) will reach a height of 30m and a spread of 18m after 10-20 years.

Suggested uses

Architectural, Low Maintenance, Foliage only, Specimen tree

Cultivation

Prefers fertile, moist soil but will grow in a variety of conditions in full sun or partial shade. Protect from cold drying winds in frost-prone areas.

Soil type

Chalky, Clay, Loamy

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)

Companion plants

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

Botanical name

Zelkova serrata

Other names

Keaki, Japanese zelkova, Saw-leaf zelkova, Keyaki

Genus

Zelkova Zelkova

Species

Z. serrata - Z. serrata is a spreading, vase-shaped, deciduous tree with smooth, exfoliating, grey bark, narrowly ovate to elliptic, toothed, dark green leaves turning yellow, orange, or red in autumn. Insignificant green flowers in spring are followed by small, wingless, green fruit.

Native to

Eastern Asia

Foliage

Deciduous

Habit

Spreading

Awards

RHS AGM (Award of Garden Merit)


Colour

Flower

Insignificant or absent, Green in Spring

Foliage

Dark-green in Spring; Dark-green in Summer; Red, Yellow, Orange in Autumn


How to care

Watch out for

Specific diseases

Dutch elm disease

General care

Pruning

Pruning group 1.

Propagation

Propagate by seed or grafting.

Propagation methods

Grafting, Softwood cuttings


Monthly care advice


Where to grow

Zelkova serrata (Keaki) will reach a height of 30m and a spread of 18m after 10-20 years.

Suggested uses

Architectural, Low Maintenance, Foliage only, Specimen tree

Cultivation

Prefers fertile, moist soil but will grow in a variety of conditions in full sun or partial shade. Protect from cold drying winds in frost-prone areas.

Soil type

Chalky, Clay, Loamy

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

Zelkova serrata (Keaki)

Common pest name

Scientific pest name

Tinocallis takachihoensis

Type

Insect

Current status in UK

Present (Limited)

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

4

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

3

General biosecurity comments

Statutory action has been taken against this in the past on imported penjing; uncertain as to how widespread it is now in the UK. If widespread; further statutory action may not be justified.

Defra's Risk register #2

Plant name

Zelkova serrata (Keaki)

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

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This plant likes... Garden match
Soil types: Chalky, Clay, Loamy 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: Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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