This profile focuses on Eastern black walnut for nut production. Persian walnuts are not recommended for commercial production in Kentucky, where Persian walnut is limited by cold temperatures, winter injury and late spring frost damage; walnut blight; and squirrels, which eat the nuts when they are immature. Detailed production information for both Eastern black walnut and Persian walnut is available in the University of Kentucky Extension publication ID-77, Nut Tree Growing in Kentucky. The University of Missouri offers a very detailed publication, listed in the Selected Resources section at the end of this publication, on establishing and cultivating Eastern black walnut for nut production.