Mostly known for it's ability to kill other plants, black walnut is also renowned for its strong, dark heartwood that is often used for high quality furniture and veneer. When grown in the open, the black walnut reaches 75' tall with a round, low branching, open crown that spreads nearly as wide as it is tall. In forests and plantations, the tree may reach 150' tall with a well formed trunk and lower limbs self pruned from a meter from the distance from the ground. It develops a deep taproot and is difficult to transplant. The hard to crack shell encases a rich flavored nut. However, the crushed black walnut shells can stain fingers, clothing, and concrete.