Corylus avellana 'Cosford Cob' (Hazel 'Cosford Cob')

Botanical name

Corylus avellana 'Cosford Cob'

Other names

Hazel 'Cosford Cob'

Genus

Corylus Corylus

Variety or Cultivar

'Cosford Cob' _ 'Cosford Cob' is a mid-sized shrub or small tree with green leaves turning yellow in autumn. It bears yellow catkins in spring and abundant (hazel) nuts in autumn.

Foliage

Deciduous

Tree shape

Upright

---

Colour

Flower

Yellow in Spring

Foliage

Green in Spring; Green in Summer; Yellow in Autumn

---

How to care

Watch out for

Specific pests

Aphids , Caterpillars , Gall mites , Sawflies , Squirrels

Diseases

Generally disease-free.

General care

Pruning

To maximise nut production break the sideshoots half way along their length in late summer. Then shorten these shoots to 3-4 buds when the catkins are shedding pollen in late winter. Remove up to one third of old overcrowded shoots to the main branches

Propagation methods

Budding, Grafting, Suckers

---

Monthly care advice

---

Where to grow

Corylus avellana 'Cosford Cob' (Hazel 'Cosford Cob') will reach a height of 4m and a spread of 4m after 10-20 years.

Suggested uses

Cottage/Informal, Flower Arranging, Hedging/Screens, Low Maintenance, Wildflower, Wildlife

Cultivation

Plant in moist, free-draining, ideally alkaline soil in full sun or partial shade. To maximise nut production, grow as a bush. Keep soil clear in a 60cm radius around trunk. Growing at least two cultivars for pollination.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Moist but well-drained, Well-drained

Soil pH

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 9, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4, Zone 3

Defra's Risk register #1

Plant name

Corylus avellana 'Cosford Cob' (Hazel 'Cosford Cob')

Common pest name

Asian longhorn beetle; Starry sky beetle

Scientific pest name

Anoplophora glabripennis

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

Recognised threat to a wide range of deciduous tress native to the UK. Already regulated it is a priority for continued surveillance and statutory action. The risk of entry is further mitigated by EU legislation requiring the monitoring of wooden packaging material originating from China.

Defra's Risk register #2

Plant name

Corylus avellana 'Cosford Cob' (Hazel 'Cosford Cob')

Common pest name

Lemon tree borer

Scientific pest name

Oemona hirta

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

Wood boring beetle native to New Zealand with a wide host range of trees and shrubs. The UK will press for consideration of UK listing.

Defra's Risk register #3

Plant name

Corylus avellana 'Cosford Cob' (Hazel 'Cosford Cob')

Common pest name

Scientific pest name

Monochamus guttulatus

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)

3

General biosecurity comments

East Asian longhorn beetle whose larvae feed on a range of deciduous trees; with a preference for dying trees. A PRA will help to better assess the level of risk to the UK.

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/