Book excerpt: Essential Perennials focuses on what every gardener needs to know to choose from the thousands of perennials available, and care for the ones you already have. This A-to-Z guide is packed with more than 2,700 plants, with each entry listing flower color, bloom time, foliage characteristics, size, and light and temperature requirements. Each profile is supported by stunning color photography that showcases the flower and foliage that make each plant unique.