How to Grow Hazel Cosford Cob
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Hazel Cosford Cob
Corylus avellana 'Cosford Cob'
shrubCosford Cob is a productive hazelnut cultivar known for its large, sweet kernels and relatively early ripening. This deciduous shrub grows to 12-15 feet tall and produces clusters of edible nuts in autumn, making it an excellent choice for home orchards and hedgerows.
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Example Hazel Cosford Cob timeline · Pittsburgh, PA (Zone 6b)
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Plant Hazel Cosford Cob
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Hazel Cosford Cob
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Hazel Cosford Cob dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-8, hardy to zone 4
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Get my Hazel Cosford Cob timeline →Growth Stages
Establishment
Year 1-2Young shrub with developing root system and initial branch framework.
Water regularly to establish deep roots. Stake if necessary. Minimal pruning beyond removing crossing branches.
Vegetative Growth
Year 2-3Vigorous shoot growth with dark green ovate leaves. Plant fills out to mature form.
Prune to maintain open center structure and remove suckers from base. Fertilize lightly in spring.
Flowering
January-MarchMale catkins (golden pollen-bearing structures) appear in late winter; smaller female flowers are less visible.
Ensure at least one other compatible hazel cultivar is nearby for cross-pollination. Do not prune flowering branches.
Nut Development
April-SeptemberFertilized flowers develop into clusters of nuts within leafy husks; nuts enlarge throughout summer.
Consistent watering is critical during this stage. Monitor for pest damage. Thin crowded nut clusters if desired.
Harvest
September-OctoberNuts mature with brown shells and dry, papery husks. Kernels fill the shell completely.
Harvest fallen nuts before wildlife takes them. Some hand-picking of higher nuts may be necessary.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Remove and destroy infested nuts before pupation. Sanitary field practices (remove fallen nuts). Difficult to control organically; may require insecticide sprays in late spring.
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Remove dropped nuts promptly to reduce larvae survival. Pheromone traps. Organic neem oil or spinosad sprays during egg-laying period.
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and
Physical barriers (netting over trees), predator decoys, trapping in severe cases. Accept partial crop loss in wildlife-friendly gardens.
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Prune infected branches (cankers) back 12 inches to healthy wood. Sterilize tools between cuts. Choose disease-resistant rootstocks if available. Remove debris.
Uses
Roasting & Snacking
CulinaryCosford Cob nuts are prized for their large size, thin shells, and sweet, fine-flavored kernels. They are excellent eaten fresh or roasted, and crack cleanly. [source]
Baking & Confectionery
CulinaryThe kernels are ground into flour or butter for baking, and are a key ingredient in chocolate hazelnut spreads and pralines. Their oil content makes them ideal for pastries. [source]
Hazelnut Oil Production
HouseholdCold-pressed hazelnut oil is extracted from the kernels and valued for cooking, cosmetics, and skincare applications. A mature tree can produce sufficient nuts for small-scale oil extraction. [source]
Wildlife & Pollinator Support
WildlifeThe early catkins provide critical early-season pollen for bees and insects emerging from dormancy. The shrub also offers shelter for birds and small mammals. [source]
Coppicing & Wattle Work
CraftHazel wood is traditionally used for coppicing and producing wattle panels for fencing, hurdles, and basket-weaving. Flexible young shoots are harvested and woven. [source]
Harvest Tips
Nuts are ready to harvest in September-October when husks turn brown and nuts fall easily from the tree. Collect fallen nuts daily and allow to dry in a warm, airy location for 2-3 weeks before storage. Crack and taste-test a sample to confirm kernels are fully mature and sweet. Dried nuts can be stored in cool, dry conditions for several months.
Fun Facts
- 🌱 Cosford Cob is one of the few hazelnut cultivars hardy enough to grow in cool climates without protection, and it was first identified as a sport in Cosford, Norfolk, England in the 19th century.
- 🌱 Hazel catkins have been harvested for pollen in Europe for centuries, valued as an early spring food supplement and as a bee forage before other flowers bloom.
- 🌱 A mature hazel tree can live and remain productive for 50-100+ years, making it a long-term investment for nut production in a home orchard.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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