Viburnum nudum 'Winterthur' (American withe rod 'Winterthur')

Botanical name

Viburnum nudum 'Winterthur'

Other names

American withe rod 'Winterthur', Smooth withe rod 'Winterthur', American witherod 'Winterthur', Possomhaw 'Winterthur', Wild raisin 'Winterthur', Naked viburnum 'Winterthur', Smooth witherod 'Winterthur', Smooth viburnum 'Winterthur'

Genus

Viburnum Viburnum

Variety or Cultivar

'Winterthur' _ 'Winterthur' is an upright, rounded, deciduous shrub with glossy, lance-shaped, dark green leaves turning reddish-purple in autumn and clusters of creamy-white flowers in early summer followed by green fruit turning white to pink to dark blue with maturity.

Native to

Garden origin

Foliage

Deciduous

Habit

Rounded

Toxicity

Berries may cause stomach discomfort.

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Colour

Flower

Cream in Spring

Foliage

Dark-green in Spring; Dark-green in Summer; Reddish-purple in Autumn

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How to care

Watch out for

Pests

Generally pest-free.

Specific diseases

Leaf spot

General care

Pruning

Pruning Group 8.

Propagation methods

Softwood cuttings

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Monthly care advice

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Where to grow

Viburnum nudum 'Winterthur' (American withe rod 'Winterthur') will reach a height of 1.8m and a spread of 1.8m after 10-20 years.

Suggested uses

Beds and borders, Low Maintenance

Cultivation

Grow in moderately fertile, humus-rich, moist but well-drained, neutral to acid soil in full sun or partial shade.

Soil type

Clay, Loamy, Sandy

Soil drainage

Moist but 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, Zone 5

Defra's Risk register #1

Plant name

Viburnum nudum 'Winterthur' (American withe rod 'Winterthur')

Common pest name

Ramorum leaf blight; Ramorum shoot dieback; Rhododendron twig blight; Sudden oak death

Scientific pest name

Phytophthora ramorum

Type

Oomycete

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)

4

General biosecurity comments

Pathogen of larch and other hosts subject to EU emergency legislation. A containment strategy is in place in the UK; reflecting its presence in wider environment/forestry settings in some areas. EU regulatory status is under review.

Defra's Risk register #2

Plant name

Viburnum nudum 'Winterthur' (American withe rod 'Winterthur')

Common pest name

assam thrips; castor thrips; chilli thrips; yellow tea thrips

Scientific pest name

Scirtothrips dorsalis

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

EU listed pest for citrus but highly polyphagous and intercepted on a number of hosts. EU legislation should be updated to reflect wider host list.

Defra's Risk register #3

Plant name

Viburnum nudum 'Winterthur' (American withe rod 'Winterthur')

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.

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/