Book excerpt: This book is designed to raise awareness of the use of wild plants in farming systems around the world. It describes the contribution of wild plants as a source of food, fuel wood, shelter, medicines and dyes, and their role in income generation for the improved welfare of farm households and local people. Wild plants are also of paramount importance as sources of wild germplasm that might enhance the productivity, disease resistance, winter hardiness, drought survival of cultured species. This publication analyses the potential of wild species, as well as the natural, social, economic, legal and institutional factors that constrain their use and development potential.