California Black Walnut occurs in two forms: regular black walnut generally from volunteer trees planted by squirrels and birds, and Claro walnut, from high-graft orchard trees. Regular walnut has a more even color and grain, but can also have curly as well a crotches, with flame grain. We have pieces over 19 feet in length. Claro walnut is known for its convoluted grain and color variability, and can show nice graft-wood transitions. Because the grafts are usually made between 3 and 7 feet, slabs are rarely over 7 feet long.