 You'll just make your life and the life of the shrub miserable in the process you'll be trimming all the time. Go with a plant that grows to the mature size of the space you have available. Talk to your nurseryman. Adapted plants should be your goal. Forget whether a plant's native to Texas or not. What you want is a plant that's happy to have a chance to perform in Texas. Crape myrtles are from China. Nandinas are from Japan. Hackberries and cottonwoods are from Texas.