Pruning & training by Christopher Brickell, David Joyce — There are so many plants that like to climb or have other growth habits that make it easy for gardeners to help them grow in a particular shape or pattern. This book covers a huge variety of those plants, as well as presenting background information on how different types of plants grow and the basics of both pruning and training. There's info here on how to prune and train established plants as well as how to get new plantings started to match your vision.