The Essence of Herbs: An Environmental Guide to Herb Gardening by Ruth D. Wrensch For any herbist this is an indispensable handbook of fascinating lore, of tips on practical herb garden design, and of comprehensive guidance in cultivating and harvesting herbs. Nonnative herbs grow best and look best in gardens that reproduce their native habitats. This view is the keystone of The Essence of Herbs, an engaging book that combines a descriptive study of herbs with a history of the role herbs have played in culture, cuisine, and medicine. Here in a book for both specialists and nonspecialists are important guidelines for the herbist who gardens in harmony with the environment. Ruth D. Wrensch lectures, teaches, and conducts workshops on herbs and herb gardening.