An iconic tree of the American prairie, our native Bur Oak is a highly adaptable tree that can tolerate drought, wet soils, and clay soils once established. It develops a large, spreading crown that is ideal for large yards and parks. Deep green, leathery leaves turn yellow in the fall. Bark becomes deeply furrowed with age. Its deep, extensive root system anchors it very solidly against the wind. All native oaks are important larval food sources for many butterfly species, and attract migratory birds.