Ty Ty Nursery offers many types of walnut trees to grow, some grafted cultivars and some are native seedling trees. Most nuts that are grown from Walnut trees are hardshell types, but the English walnut is fairly thin shelled enough to easily crack out kernels without? using a hammer. The Black Walnut is an excellent eating, native American tree, and the black walnut tree is extremely cold hardy with reliable nut production each year and suitable to grow in every State. Walnut trees have become an important feature of American culture and holiday celebrations during Thanksgiving and Christmas seasons, not only as nut producing trees, but also as shade trees. The Thomas Black Walnut is a grafted tree and produces thinner nuts sooner than the regular black walnut.