where are walnuts grown
There are nearly two-dozen different types of Walnut trees in the world, though most are native to the United States. Among the most popular are: 1  Black Walnut: The tallest of all Walnut trees, the Black Walnut can grow as high as 100 feet. 2  The tree's fruit grows in clusters and falls in autumn. 3  The Black Walnut's shell is unique in that it contains a dark brown dye that will stain any item it comes in contact with.