My 8 year old and 5 ft. bay tree is pot bound, (hardly any leaves but healthy trunk). Can I do root pruning on it? it's the only way I know to be able to regenerate this plant. The pot it's in is large enough for me to move about. Any larger it would be too heavy and so I have no choice but to keep the plant at it's present size. Also I need to add new soil and more nutrients. Any advice is welcome. Thanks.