The butternut or white walnut is a large tree from Eastern N.America, growing 25 m (80 ft) high (3 m in 10 years). It bears large edible nuts the size of walnuts, which make excellent eating; they also yield an edible oil. Many cultivars in N.America. Self-fertile. These seedlings should inherit many of their parents characteristics. Give full sun and a well-drained soil; young trees may need protection from late frosts. Hardy to about –30°C. Plants are grafted or are seedling trees from known mothers, 15-30 cm high. Note that seedling trees will not be identical to the mother tree so there may be variation in the nut shape and size.