Horticulture is a wide field and includes a great variety and diversity of crops. The science of horticulture can be divided into several branches depending upon the crops it deals with. Horticultural food crops include an enormous array of species that are grouped in various ways. The Horticulture has become a key drivers for economic development in many of the states in the country and it contributes 30.4 per cent to GDP of agriculture. The horticulture sector is spread across cultivation, propagation, processing and marketing of vegetables, fruits, nuts, ornamental plants, flowers, spices and turf. Understanding the physiology of plants is fundamental to horticultural studies and practice. Principles of Horticulture is an excellent introduction to a wide range of aspects of commercial and leisure horticulture. This book an essential practical workbook for horticulture students and gardners alike.