This book is meant for teaching useful plants under the subject heading of Economic Botany . The most important useful herbs of the planet earth are explained in terms of their active chemical compounds and relevant properties. All the conventional topics such as Food plants, spices, timber etc have been revamped with the latest research inputs on those plants and the new features of these products. Herbal Cosmetics, Antioxidant therapy, Natural Dyes, perfumery and Aromatherapy, Biopesticides, Biofuel and Biofertilisers are added which will increase the acceptance of plant- based courses. In addition, in the beginning of each chapter, relevant chemistry of natural products is added which will explain the said actions in a meaningful way.