Known also as hazelnuts, most filberts are cultivars of the European filbert (Corylus avellana). Hybrid filberts, American filberts (C. americana), beaked filberts (C. cornuta), large filberts (C. maxima) and ornamental Turkish filberts (C. colurna) are successfully grown in climates colder than the Willamette Valley in Oregon and Washingon, home of the commercial U.S. crop. Whether you grow filberts as trees or shrubs, their nuts grow and develop the same way.
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