Vaccinium 'Top Hat' (Blueberry 'Top Hat')

Botanical name

Vaccinium 'Top Hat'

Other names

Blueberry 'Top Hat', Vaccinium corymbosum 'Top Hat'

Genus

Vaccinium Vaccinium

Variety or Cultivar

'Top Hat' _ 'Top Hat' is a compact, mound-forming, deciduous shrub with glossy, dark blue-green leaves that turn orange-red in autumn, clusters of white flowers in late spring and edible, blue berries in mid- to late summer. This variety is suitable for growing in containers.

Foliage

Deciduous

Habit

Compact, Cushion or Mound Forming, Dense, Small

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Colour

Flower

White in Spring

Foliage

Blue-green in Spring; Blue-green in Summer; Orange-red in Autumn

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How to care

Watch out for

Specific diseases

Foot and root rot

General care

Propagation methods

Seed, Softwood cuttings

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Monthly care advice

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Where to grow

Vaccinium 'Top Hat' (Blueberry 'Top Hat') will reach a height of 0.6m and a spread of 0.6m after 10-20 years.

Suggested uses

Beds and borders, Containers, Cottage/Informal, Flavouring food and drinks, Low Maintenance

Cultivation

Plant in acid, humus-enriched soil in full sun or part shade. An excellent choice for container planting.

Soil type

Loamy, Sandy

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid

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, Zone 4

Defra's Risk register #1

Plant name

Vaccinium 'Top Hat' (Blueberry 'Top Hat')

Common pest name

Alfalfa dwarf; Anaheim disease; California vine disease; Dwarf disease of alfalfa; Dwarf disease of lucerne; Leaf scald of oleander; Leaf scald of plum; Leaf scorch; Phony disease of peach; Pierce's disease of grapevine; Variegated chlorosis of citrus

Scientific pest name

Xylella fastidiosa (all other strains and subspecies)

Type

Bacterium

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)

4

General biosecurity comments

A bacterial disease with a wide host range and many sub-species and strains; including those that could thrive in cooler climates; showing different levels of pathogenicity. Although EU regulated; there is some concern about the risk of introduction. Should an outbreak occur; there would be a need for eradication action which would result in environmental and social impacts.

Defra's Risk register #2

Plant name

Vaccinium 'Top Hat' (Blueberry 'Top Hat')

Common pest name

leaf rust of blueberry

Scientific pest name

Thekopsora minima

Type

Fungus

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)

3

General biosecurity comments

Rust fungus affecting blueberry and hemlock. This fungus has been detected in Europe (Germany; Netherlands and Portugal). Some uncertainty about the suitability of UK native host species. But the case for regulation should be considered based on the EPPO PRA.

Defra's Risk register #3

Plant name

Vaccinium 'Top Hat' (Blueberry 'Top Hat')

Common pest name

A dagger nematode

Scientific pest name

Xiphinema rivesi

Type

Nematode

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 nematode pest which is also a virus vector. Present in a number of European countries; but not detected in the UK; although may have been present in soil attached to plants imported to the UK. No evidence of significant damage seen elsewhere in Europe.

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/