This is my personal favorite reference book for Northern herb gardens. Surprisingly, this book features many perennials that I would not have considered herbs, such as Broadleaf Plantain (a common lawn weed). The format is simple, with A-Z entries of herbs, most with illustrations. The entries include the cultural significance and history of the plant, as well as the medicinal/culinary properties, toxicity, and cultivation guidelines. The encyclopedia also includes several sections of beautiful color photos, and several in-depth sections of how to garden with herbs, and how to use the herbs you have grown. The book is both informative and inspiring!