Bringing together reasons for why and where weeds occur and the ecological importance of weed management, this updated edition (previously entitled "Weed Ecology") provides an in-depth study of plant ecology with greater coverage of invasive plant biology and more concise statistics. In a new, larger format, printed in two colours, and illustrated throughout with figures, tables and case studies it is an essential text for students in plant ecology, agriculture and horticulture.Praise for the first edition:"As an undergraduate text [the book] does a superb job of traversing the wide expanse of ecology... several chapters should be key components of any course on understanding weed ecology" - Biological Invasions"The information is provided in short chapters, which are very well written, have their own comprehensive reference lists, and contain many excellent examples from around the world. The book will be an extremely valuable textbook for undergraduate and graduate students studying weed science and agriculture" - Biological Agriculture and Horticulture