The bluebonnet is the state flower of Texas. It is a hardy winter annual native to Texas that grows along roadsides and pastures with white-tipped spikes of densely arranged ice blue flowers. Bluebonnets prefer well-drained, gravelly soil and full sun. The mockingbird is the state bird of Texas. It is about 10 inches long with gray feathers and a whitish underside, darker gray wings and tail with white patches. The pecan tree is the state tree of Texas. Mature trees can reach heights over 150 feet tall with trunks more than 3 feet in diameter.