The black locust tree (Robinia pseudoacacia), also called false acacia, grows in U.S. Department of Agriculture plant hardiness zones 3 to 8. The thorns that grow in pairs below the leaves serve as protection for the tree, but can be potentially dangerous in your yard.

Do Robinia trees have thorns?

pseudoacacia rootstock (also known as false acacia or black locust), a vigorous green-leaved tree with thorns. ... Damage to roots, for example by mowing or whipper snippering, can lead to suckering.

Do all black locust trees have thorns?

Many varieties of locust trees have long sharp thorns and there are a few thornless species. ... Compared to honey locust timber, black locust wood is more common. Most types of locust trees grow in the eastern states of North America. The species of locust trees are divided into two genera: Robinia and Gleditsia.