These books will teach you to use trees most effectively in gardening and agriculture. They will also teach you how to prune trees, shrubs, and every other plant. You will first want to read my articles on the functions of trees, especially on pruning. All articles on trees are linked on this page. Ordering Amazon products from a link on this website helps to me to pay my expenses. Amazon pays a small percentage of their proceeds to the seller. So far, I have earned exactly $25 in 7 years.