I find this distracting. Some smaller pictures adjoin one another with no visible demarcation where one begins and the other ends. The authors have written a useful book, regardless of such editorial errors of judgment. The Garden Conservancy's Open Days Directory Books are helpful research tools. However, one of the best and most enjoyable means of learning about plants and gardens is to visit them.
Public gardens are always an available resource.
Private gardens, rarely available unless the owner is a friend, are often more germane. A piece of cake. The fat yellow-covered book packed with information about gardens across the United States will entice you to plan vacations around their listings.