Liquidambar styraciflua 'Slender Silhouette' (Sweet gum 'Slender Silhouette')

Botanical name

Liquidambar styraciflua 'Slender Silhouette'

Other names

Sweet gum 'Slender Silhouette', Columnar sweet gum, Fastigiate sweet gum

Genus

Liquidambar Liquidambar

Variety or Cultivar

'Slender Silhouette' _ 'Slender Silhouette' is an upright, narrowly columnar, deciduous tree with palmately lobed, glossy, dark green leaves, turning yellow to orange-red in autumn. Insignificant greenish-white flowers in spring and are followed by clusters of woody, burr-like fruit capsules.

Foliage

Deciduous

Tree shape

Broadly conical

Awards

RHS AGM (Award of Garden Merit)

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Colour

Flower

Yellow-green in Spring

Foliage

Dark-green in Spring; Dark-green in Summer; Dark-red, Dark-purple in Autumn

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How to care

Watch out for

Pests

Generally pest-free.

Diseases

Generally disease-free.

General care

Propagation methods

Semi-hardwood cuttings

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Monthly care advice

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Where to grow

Liquidambar styraciflua 'Slender Silhouette' (Sweet gum 'Slender Silhouette') will reach a height of 16m and a spread of 3m after 20-50 Years.

Suggested uses

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

Cultivation

Plant in moderately fertile, preferably acid or neutral, moist but well-drained soil in full sun for best autumn colour, or partial shade.

Soil type

Clay, Loamy, Sandy

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, 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

Defra's Risk register #1

Plant name

Liquidambar styraciflua 'Slender Silhouette' (Sweet gum 'Slender Silhouette')

Common pest name

Elm spanworm; Ennomid; white; Linden moth; snow-white

Scientific pest name

Ennomos subsignaria

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 which defoliates deciduous trees and; with repeated infestation; can cause tree death. Present in North America and current import requirements do not fully mitigate the risk of introduction. A PRA will help to assess the level of risk more fully.

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/