Pruning helps shape a plant or tree while promoting future growth. But if done correctly, it can do more harm than good. In this episode, GGW brings in best-selling garden author Tracy Desabato-Aust to demonstrate the science behind the practice. Host Joe Lamp'l adds his expertise by showing you the five basic keys to pruning like a pro. Learn the benefits, common mistakes and step-by-step instruction on how to promote healthy plants with selective pruning.