The Osage orange (Maclura pomifera), also called horse apple, hedge apple, bodark and bois d’arc, is a 35- to 70-foot tree that was often heavily pruned and planted in tight hedgerows to contain livestock. The tree has very dense, rot-resistant wood that excretes a milky sap. The branches are armed with thorns at leaf bases. Osage orange fruit is green, bumpy and inedible. The juices are a natural pesticide, and squirrels like to eat the seeds. Plant Osage orange hedgerows in U.S. Department of Agriculture plant hardiness zones 4 through 9.