Hydrangeas: A Gardener's Guide by Toni Lawson Hall (Timber Press 2005)(635.933372). This volume is made for the hydrangea enthusiast. The first half of the book deals with hydrangea cultivation; the second half is a catalog of cultivars. The information contained herein is easy enough to intrigue novice plantsmen but specific enough to satisfy the experienced hydrangeaphile. My rating: 7/10, finished 2007.