This is the most comprehensive source of information on hydrangeas that I have ever seen. There is detailed advice on every aspect of growing hydrangeas, including soil preparation, watering, and the effects of color in hydrangeas due to soil content. Generous illustrations show the different types of leaves on the various types of hydrangeas. The most valuable part of the book is a section devoting a full page to specific varieties and shows a photo, characteristics in chart format and a detailed narrative description. This book is well worth the price!