Perennial gardening can be easy, fun and rewarding, especially when you have this beautifully illustrated guide at your fingertips. With detailed accounts of 89 different perennials, along with information on 621 recommended varieties and cultivars perfect for Pennsylvania gardens, this book takes the guesswork out of perennial gardening. The authors' practical, commonsense advice will help bring color and variety to your garden: * Flower and foliage colors * Height and spread ranges * Blooming periods * How and when to start your plants * Planting strategies * Light, water and nutrient needs * Choosing the best perennials for different growing conditions * Over 550 color photographs.