What makes this book so terrific is the way it's laid out. Plants are grouped by size, season of bloom, and color. For example, you want to find a tall yellow plant that blooms in summer. Just turn to the part of the book that says, "Tall, summer interest," and look for the yellow flowers grouped together. Then choose from among those possibilities something that will grow in your garden. Every plant is further described for hardiness, care, use, and propagation. Further, it is not limited to a few selected plants, but is quite complete. The only perennial that I could think of not mentioned was lavender.