Native to North American, the black walnut tree (juglans nigra) can reach heights of up to 40 feet. Its bark is deeply grooved and dark gray or black in color. The black walnut tree is mainly known for its beautiful, hard wood and tasty nuts, which are a baker's favorite for cakes and cookies. Over the centuries the black walnut tree has also been prized by herbalists who value its bark, leaves and green hulls of the nuts to maintain good health.
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