This book is a milestone in understanding the role of trees grown, outside forests, on farms throughout the developing world, particularly in the light of increasing intensification of agriculture. It examines subsistence needs, market opportunities and constraints, allocation of land and labour, and risk management. In showing why farmers decide to grow or not to grow trees, it fills a gap in our knowledge about farming systems and provides a guide to encouraging farm forestry throughout the world. This text will be of interest to students and professionals in forestry, agriculture, rural development and conservation.