How to Grow Cosford Hazelnut
Wikimedia Commons
Cosford Hazelnut
Corylus avellana 'Cosford'
shrubCosford is a premium hazelnut cultivar prized for its large, high-quality nuts and relatively early maturity. This deciduous shrub produces abundant elongated nuts with thin shells and excellent flavor, making it a favorite for home orchards and commercial cultivation. It typically grows 12-15 feet tall and requires cross-pollination with a compatible male cultivar for optimal nut production.
When should you plant Cosford Hazelnut in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Cosford Hazelnut timeline · Pittsburgh, PA (Zone 6b)
-
Plant Cosford Hazelnut
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Cosford Hazelnut
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Cosford Hazelnut dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 4-8, with best nut production in zones 5-7
Sign up free to see if Cosford Hazelnut grows in your zone — and get a personalized planting timeline.
Get my Cosford Hazelnut timeline →Growth Stages
Establishment
Year 1-2Young transplant with limited branching, establishing root system. Bare-root whips typically 2-4 feet tall at planting.
Water consistently, protect from harsh winds, stake if necessary. Remove competing central leaders to encourage multi-stem form. Apply 2-3 inches of mulch around base.
Vegetative Growth
Year 2-4Develops lateral branches and establishes shrub form. Plant grows vigorously with abundant foliage. Male catkins visible in late winter but female flowers not yet productive.
Prune to maintain open vase shape for sunlight penetration and easier harvesting. Remove dead or crossing branches. Ensure pollinator variety is planted nearby.
Flowering & Pollination
January-MarchMale catkins emerge in late winter (January-February); tiny red female flowers appear on branch tips in early spring. Catkins shed pollen for 2-3 weeks.
Avoid pruning during flowering to prevent removing female flowers. Ensure compatible pollinizer (Barcelona, Ennis, or other Corylus cultivars) is nearby for cross-pollination. Monitor for spring frost.
Nut Development
March-AugustFertilized female flowers develop into clustered nuts with leafy husks. Nuts enlarge through spring and summer, reaching mature size by late August.
Maintain consistent moisture during development. Apply balanced fertilizer in May if growth appears weak. Thin excessive clusters if nuts too crowded (optional, up to 3-4 nuts per cluster acceptable).
Ripening & Harvest
August-SeptemberNuts mature to golden-brown color and husks dry. Kernels fill completely; nut drops from tree or falls when gently shaken. Harvest window is typically 2-4 weeks.
Begin monitoring nuts in late August. Spread tarps beneath trees to collect dropped nuts. Cure in warm, well-ventilated space for 2-4 weeks before storage. Remove adhering husk bits by hand or light rubbing.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Remove and destroy infested nuts; apply spinosad in early summer; remove plant debris harboring larvae; use bagging or netting on developing clusters
-
Spray with strong water stream; apply insecticidal soap; use neem oil in early season; encourage beneficial insects
-
Prune infested shoots; apply Bt (Bacillus thuringiensis) in spring; remove and destroy webbed leaves
-
Collect and destroy fallen nuts; apply spinosad at petal fall; cultivate soil to expose overwintering larvae
-
Choose resistant cultivars; prune 12 inches below cankers in dry weather; sterilize tools; avoid overhead irrigation
Uses
Premium eating nut and confections
CulinaryCosford hazelnuts are prized for eating fresh, roasting, and use in premium chocolate, pralines, and baked goods. Their large size, thin shells, and superior flavor make them ideal for gourmet applications and nut-based cuisine. [source]
Hazelnut oil production
CulinaryPressed hazelnut oil is a flavorful cooking oil used in dressings, cooking, and finishing dishes. Cold-pressed oils retain delicate nutty flavors ideal for gourmet applications. [source]
Ornamental landscaping value
HouseholdCosford hazelnuts provide year-round interest with winter catkins, spring flowers, summer foliage, and decorative nuts. The attractive multi-stem shrub form makes it suitable for hedgerows, screens, and aesthetic landscapes. [source]
Wildlife food source and habitat
WildlifeHazelnut shrubs provide food for squirrels, birds, and other wildlife while offering dense branching for nesting and shelter. The abundant pollen supports early-season pollinators. [source]
Wood and basket weaving material
CraftHazelnut branches are traditionally used for wicker work, hurdles, and flexible wood products. Young, straight growth produces excellent pliable material for traditional crafts. [source]
Harvest Tips
Cosford nuts typically mature in late August through September. Nuts are ready for harvest when the husk turns brown and nuts drop easily from the tree or fall when branches are gently shaken. Spread tarps or netting beneath trees to collect falling nuts. Remove adhering husks promptly by rubbing against a rough surface or by hand. Air-dry harvested nuts in a warm, well-ventilated location for 2-4 weeks (until moisture content drops to ~5-8%) before storage. Store in cool, dry conditions (35-45°F, <10% humidity) for extended shelf life of 6-12 months.
Fun Facts
- 🌱 Cosford hazelnuts are named after the village of Cosford in Norfolk, England, where the cultivar was discovered and selected in the 1800s for superior nut quality and productivity.
- 🌱 Hazelnut pollen is one of the earliest to appear in spring and is often responsible for late-winter allergies; the catkins can be stunning golden-yellow displays visible from considerable distance.
- 🌱 Hazelnuts have been cultivated and valued for thousands of years—fossil pollen suggests hazels provided food to prehistoric Europeans, and the name 'hazel' comes from Old German meaning 'covering or cap,' referring to the leaf-like husk.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Cosford Hazelnut planting timeline
Tell us your zip code and we'll calculate exactly when to start Cosford Hazelnut seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Cosford Hazelnut timeline →