Walnuts are tree nuts of the genus Juglans, the most common varieties being the English (or Persian) walnut (Juglans regia) or the black walnut (J. nigra).
Technically, walnuts are stone fruit and not true nuts. The “nuts” are picked when green for pickled walnuts or when fully ripe for nut meat or walnut oil. While still in the shell, the nut meat is protected by the antioxidants in the brown seed coat.
English walnuts originated in Persia (they were not grown in England but were transported by English
