Walnut-Black 2.0"B

The black walnut is a Chicago-area native tree that provides excellent shade for large properties. It needs to be sited with care since the tree produces a chemical that is toxic to some other plants. The fruit is a rounded yellow-green husk containing a nut that is a food source for squirrels. The black walnut also attracts the banded hairstreak butterfly serving as a caterpillar host.