Understanding Compatibility
It is highly recommended that you have at least 3 different pollinizers in an orchard plot to cover the different timing of pollen release. Flowers are open and receptive for a longer period of time than the pollen is released from each variety. The different pollinizers need to cover early, mid and late release, set to the timing of the bloom from your main crop variety. For example, Jefferson is a late bloomer. It needs pollinizers that shed pollen later and much later than an early bloomer like Yamhill.
History
Hazelnuts, sometimes called filberts, have a long
and fascinating history. The name filbert probably
derived from the German term vollbart (full beard)
in reference to some hazelnut varieties in which the husk entirely covers the nut. However, some people believe the name derives from St. Philibert, whose feast is celebrated on August 20, about the time the earliest hazelnuts ripen in England. In the Pacific Northwest, we grow Corylus avellana, the European hazelnut. The genus name Corylus comes from the Greek word korys (helmet or hood). The word hazelnut is derived from the Anglo-Saxon word haesel (bonnet).
Planting Stock
Conventionally propagated bare-root hazelnut
trees should be at least 0.5 inch (1.3 cm) in diameter at 6 inches (15.2 cm) above the soil line. Trees produced in pots from micropropagated cuttings will often be smaller, both in stem diameter and height,
but should have a well-developed root ball to ensure good performance in the field.