oregon's state nut, the filbert, also known as the hazelnut, is oregon's official state nut. filbert trees bloom and pollinate in the middle of the winter and can produce nuts for several hundred years. it turns out that the tiny hazelnut is a true hero in preventing heart disease as well as many cancers. filberts are also a recognized "best food" for the popular low carbohydrate and mediterranean diets. hazelnuts are a natural source of the phytoestrogens, flavanoids, and isoflavones.