The two most common major species of walnuts are grown for their seeds - the Persian or English walnut and the black walnut. The English walnut (J. regia) originated in Iran (Persia), and the black walnut (J. nigra) is native to eastern North America. The black walnut is of high flavor, but due to its hard shell and poor hulling characteristics it is not grown commercially for nut production. Numerous walnut cultivarshave been developed commercially, which are nearly all hybrids of the English walnut.WHAT IS WALNUT?A walnut is the nut of any tree of the genus Juglans (Family Juglandaceae), particularly the Persian or English walnut, Juglansregia. Walnuts are rounded, single-seeded stone fruits of the walnut tree commonly used for the meat after fully ripening.

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