I take care of properties with the tall variety of Crape myrtles. The base is supposed to be just trunks (4 to 5 feet) and the tops (3 to 4 feet). The Crape myrtles keep sending up saplings from the bottom. Is there a secret that someone can share with me or do I just keep on cutting them off at the ground level. I don't mind the cutting but sometimes the Crape myrtles just say "I'll show you I'll send up the one you cut off plus one more!"