Photos are representative and may not match your specific variety.
Hazelnut (Theta)
Nut tree
Nut treeCorylus avellana 'Theta'
- Partial sun
- Zones 4–8
- 120 days to maturity
- Fruits
- 144" spacing
- Moderate water
- Perennial
- pH 6–7.5
Overview
A breakthrough variety bred at Oregon State University, Theta represents the future of hazelnut growing with complete immunity to Eastern Filbert Blight. This disease-resistant variety produces medium-sized nuts with excellent flavor and kernel quality, making it perfect for regions where traditional hazelnuts struggle. Theta opens up hazelnut growing to gardeners in previously unsuitable areas while delivering reliable, heavy crops.
Planting
Plant bare root or container trees in early spring. Self-fertile but produces better with cross-pollination.
Growing
Sun: partial. Water: moderate. Soil pH: 6–7.5. Space plants 144" apart. Germination: 30-90 days.
Pests & diseases
Common pests: Filbert aphid, mites, filbert weevil. Common diseases: Generally disease resistant, bacterial blight possible.