Ball Perennial Manual, Jim Nau author..This large gardening book is a very whorthwhile addition to any northern gardeners library. Mr. Nau gives information on selecting, planting, nurturing, and propogating many of the common (and some not so common) plants. Especially helpful is the winter survival tips found at the end of each plant section. The Ball Perennial Manual has tips for any gardener, new and old gardeners will save time and money by reading this very informative manual.