Near the beginning of the book is a wonderful section on how to put together a "planting pyramid" for four-season interest. (Hint: You don't start with annuals or even perennials, as so many beginning gardeners do.) Additional design principles and suggestions are found after the "season" chapters.
Finally, the book closes with a limited "encyclopedia" of four-season plants which includes some suggested cultivars, cultural details for the plants, what seasons the plant holds particular interest, etc. This section is divided into deciduous trees, evergreen trees, deciduous shrubs, evergreen shrubs, perennials, etc.
In all, even if you don't have time to read all of the text, which is a pleasure in and of itself...this author is a good writer...there is still a wealth of helpful information to be found in this book.