The Best Can Cows Eat Locust Trees Ideas. Black locust is raised specifically to feed domestic. The bark, seeds, leaves and twigs of the black locust tree are toxic to humans, cattle, poultry, sheep, and horses.
The flowers are the only edible part of the black locust tree (see below)! Cows like the leaves, but their fat lips can't get too thorough. Feeding whole locust seed guarantees that you are going to have honey locust everywhere.