We run one greywater pipe from our kitchen sink, and two from our laundry outlet to some backyard fruit trees. In order to ensure your trees will be benefited by this grey water, you should convert to all biodegradable products, its a win-win sitaution, because they are better for you as well as the environment. We did a workshop with Brad Lancaster, and found much of his information to be pivotal in creating greywater systems. Brad is a seasoned permaculturist, and all around great human, who practices in the desert city of Tuscon, Arizona.