Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent within its scope

This is an excellent book for gardeners in USDA Zones 3b through 5b east of the 100th meridian. While one can certainly quarrel with which genera are covered, within its scope this book offers very solid advice. No similar reference offers as much breadth regarding specific cultivars. I hope the publisher will offer an expanded (including Thalictrums and Polygonatums!) and updated second edition in the near future. If you are a beginning to intermediate gardener this book is definitely worth having.