Salix hastata 'Wehrhahnii' (Wehrhahnii willow)

Botanical name

Salix hastata 'Wehrhahnii'

Other names

Wehrhahnii willow, Dwarf willow

Genus

Salix Salix

Variety or Cultivar

'Wehrhahnii' _ 'Wehrhahnii' is a slow-growing, upright, deciduous shrub with dark purple-brown stems, oval, bright to grey-green leaves, and long, showy, silvery grey male catkins in spring.

Foliage

Deciduous

Habit

Open branches, Upright

Awards

RHS AGM (Award of Garden Merit)

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Colour

Flower

Silvery-grey in Spring

Foliage

Grey-green in Spring; Grey-green in Summer

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How to care

Watch out for

Specific pests

Aphids , Caterpillars , Leaf beetles (willow and poplar) , Sawflies

Specific diseases

Anthracnose diseases , Rust

General care

Propagation methods

Grafting

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Monthly care advice

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Where to grow

Salix hastata 'Wehrhahnii' (Wehrhahnii willow) will reach a height of 1m and a spread of 1m after 5-10 years.

Suggested uses

City, Low Maintenance

Cultivation

Plant in deep, moderately fertile soil in full sun.

Soil type

Clay, Loamy, Sandy

Soil drainage

Moist but well-drained, Moisture-retentive

Soil pH

Acid, Alkaline, Neutral

Light

Full Sun

Aspect

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, Zone 5

Defra's Risk register #1

Plant name

Salix hastata 'Wehrhahnii' (Wehrhahnii willow)

Common pest name

Scientific pest name

Agrilus fleischeri

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)

5

General biosecurity comments

Pest of poplar; native to East Asia. Likely to be damaging if introduced to the UK. Protecting against the risk of entry via wood packaging material and other means remains a priority. A Europe-wide assessment would be helpful; to consider strengthened regulation.

Defra's Risk register #2

Plant name

Salix hastata 'Wehrhahnii' (Wehrhahnii willow)

Common pest name

Japanese swift moth

Scientific pest name

Endoclita excrescens

Type

Insect

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

Polyphagous moth pest whose larvae feed off a range of herbaceous and woody hosts. Native to East Asia where substantial impacts have been observed; and current import requirements do not fully mitigate the risk of introduction. A PRA will help to assess the level of risk more fully.

Defra's Risk register #3

Plant name

Salix hastata 'Wehrhahnii' (Wehrhahnii willow)

Common pest name

Scientific pest name

Hylesia nigricans

Type

Insect

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

South American moth which could be damaging to broadleaf species if introduced to the UK; as well as having human health impacts. The main pathway is likely to be goods (including non-plant material) imported from South America and awareness raising with the main industry sectors is recommended.

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/