Walnut trees, genus Juglans, are plants which mostly grow in the northern hemisphere. They can reach ten to forty metres (30-130 ft) in height. They are used for timber. In addition, the fruit is eaten and can be used to make oil. The fruit of Juglans are called walnuts. The wood is very hard, and dark in color. It is mostly used in furniture. The walnut tree's fruit's outer casing were used by Native American tribes to poison fish.
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