Type
pollinizer, disease-resistant
Hazelnut variety
Theta Hazelnut
Theta is commonly used as a compatible pollinizer for Oregon hazelnut cultivars and also produces nuts. It has resistance to eastern filbert blight.
Season
early fall
Best for
pollination partner, home orchards
About Theta
Theta is an Oregon State University hazelnut released primarily as a pollinizer. It is highly resistant to eastern filbert blight and has an upright, relatively low-vigor growth habit.
Growing Theta Hazelnut
Use Theta where its pollen-shed timing matches the main cultivar, rather than expecting it to serve as a principal nut crop. Keep pollinizer trees distributed through the planting so winter pollen reaches all production trees.
Full growing guide
For planting, care, pollination, and harvest that apply to all hazelnut, see the complete guide.
How to grow HazelnutOther hazelnut varieties
Variety characteristics are general guidance for US home gardens; chill hours, hardiness, and pollination vary, so confirm suitability for your zone. Availability differs by supplier. Page updated Aug 4, 2026.