Synopsis India due to its unique variety of geographical and climatic factors, has had a rich and varied flora of medicinal value since the vedic period. The trade structure of the medicinal plants is practically very complex and diverse. Drug usage in human cultures is very ancient and was often associated with religious and cultural ceremonies and customs. The most prevalent psychoactive drugs in preindustrial times were hallucinogenic plants also classified as psychotropic substances. In this book the author has given a vivid description and cultivation procedure of these hallucinogenic and narcotic drug producing medicinal plants. Most of these plants are the good sources of medicine, food and fiber. One of the main objectives of this book is to motivate and guide those farmers, who want to grow these plants in their already existing agricultural fields, for their economic benefit.