Plant ecology is a subdiscipline of ecology. It is the study of the distribution and abundance of plants, the effects of environmental factors upon them, and the interactions among plants and other organisms. Plant ecology focuses on plant communities and the important forces such as competition and their succession processes. It covers a wide range of topics related to plant mutualism, parasitism, commensalism, herbivory, plant abundance, their colonization and local extinction, life forms, and reproduction. The study of plant ecology is significant for agriculture, forestry, fishery and aquaculture, wildlife management, rangeland management, watershed management, soil conservation, and pollution control. This book outlines the processes and applications of plant ecology in detail. There has been rapid progress in this field and its applications are finding their way across multiple industries. Scientists and students actively engaged in this field will find this book full of crucial and unexplored concepts.