The walnuts are medium-sized to large stately trees traditionally planted in gardens for many centuries, as much for their noble appearance as for their fruit and timber value. They have large and imposing pinnate leaves which are reminiscent of ash. Walnuts are happy in most well-drained soils.
The black walnut, Juglans nigra, is a native of east and central U.S.A., forming a large wide-spreading tree with deeply channelled bark and magnificent leaves, 1 to 2 ft. long, which are aromatic when crushed.
The common walnut, J. regia, is a slower-growing, less imposing, south eastern European and Asiatic species forming a medium to large-sized round-headed tree. There are a number of varieties of French origin grown only for their nuts and making large bushes or small compact trees.