Corylus avellana

The hazelnut breeding program at Oregon State University directed by Shawn Mehlenbacher uses the genetic diversity in the genus Corylus to create new cultivars with resistance to eastern filbert blight. Theta is a 2009 release that is immune to the blight. Theta pollinates Jefferson and Eta with sizable nuts of its own. Zone 5-8

Plant Characteristics
Pest Resistance Very Good
Disease Resistance Excellent
Drought Tolerance Good
Heat Tolerance Very Good
Humidity Tolerance Very Good
Sun Tolerance Very Good
Wet Soil Tolerance Fair
Shade Tolerance Good
No Spray Excellent
Fresh for Kids Very Good
Deer Resistance Fair
Thorns No
Plant Type Shrub
Soil Type Adaptable
Edible Type Nut
Self Fertile No
This information is accurate to the best of our knowledge, comments/opinions are always welcome

Due to import restrictions we are unable to ship Theta Filbert Nut to Europe,...

Filbert Care Guide

Filbert Contorted In Snow
Filbert in the winter

Filberts also called hazelnuts or hazels, filberts are deciduous shrubs 6' to 30' which produce small nuts in the fall. They grow best in zones 8 and 9 in the Northwest, but to well in 6 and 7 pretty much throughout the country. Self-unfruitful; plant at least two varieties.

Plant filberts in a spot protected from bitter winter winds. The plants do not have tap roots, but put down very deep roots. They should have a deep, well drained, fertile, humus soil. In colder climates, where plants don't grow as large they need a space only 10 to 12' across.

Because filberts are small trees, it is more practical to mulch then than larger nut trees. Use hay, leaves, or other organic material. The nutrients the mulch contributes to the soil is important to maintain of vigorous growth and good nut production. Further to promote growth, you should fertilize the plants with a balanced fertilizer such as 20-10-10. Apply 1/2 cup after the young plants are making growth; 1 cup the next year; and from then on increase the dosage by 1 cup a year until you reach 6. This is about the maximum for cold climates; but in milder areas, you can increase the supply 30 to 50%.

Filberts start to bear two or three years after they are planted. They reach good production three or four years later, but are likely to become erratic after ten years unless they are pruned severely.

Nuts are harvested from the ground after they drop. If the husks remain, these must be removed. The nuts should then be spread out in a warm dry, shady place to dry.

suggested Pollinizers
Also compatible
Feilx, Eta, Theta, Yamhill
Flowers to late for other pollination
York, Felix
Yamhill, Gama McDonald
McDonald, York, Jefferson
Yamhill, Felix
York, Dorris, Wepster, Jefferson
Gamma, Epsilon
McDonald, York, Felix
Yamhill, Lewis, Gamma
Wepster, York, Jefferson
Yamhill, Sacajawea
Gamma, Felix, York
Translation missing: