Hazelnuts, also known as filberts, are native to Iowa but are smaller and harder to shell than ones grown in the Pacific Northwest. Researchers are working on developing hazelnuts for Midwest production that will compete more effectively on the open market. These tall, woody bushes grow in a similar fashion and shape as elderberries. Almost every part of the hazelnut is useful. They can be sold whole or shelled, raw or roasted or can be pressed for their oil. The mash that remains can be used for livestock feed.