Black Walnut Bonsai
One of the main reasons is the leaf size.
Black walnut bonsai. Seedlings aren t worth bothering with unless you plan to plant them and allow them to grow into substantial trunks six to eight inches in diameter. They will only work as very large trees. Personally i will never use walnut for bonsai. The second is the caorse growth habit.
Black walnut is a very very frustrating choice for bonsai.