Black Walnut - 100 Most Common North American Trees

"Trees produce a strong tap root on well-drained loose soils and recover poorly after transplanting. Trees with trunks to five feet in diameter can be found in the eastern part of the country. A yellow dye is made from the fruit husks. The seed is used in candymaking, cleaning abrasives and explosives.
The tree is probably best used in a park, campus or other open space area. However, the fruit is very hard and can dull a lawn mower blade quickly and a mower can ‘shoot’ the fruit across a lawn at a high rate of speed, possibly injuring people in the area.
Place the tree so it will receive an adequate supply of water. It is not drought tolerant, often dropping leaves in dry spells and is poorly adapted for urban soils. It is really most happy in the loose gravely soil of stream banks and other undisturbed areas but tolerates alkaline and wet soil." - From Fact Sheet on Black Walnut - USDA Forest Service

How to Manage Black Walnut - USFS
Black Walnut Habit and Culture