Exotic invasive plant species pose a serious threat to native biodiversity. Invasive plants transmogrify the landscape ecology in a highly complex manner leading to a sort of ecological explosion. Global terrestrials as well as aquatic ecosystems are invaded by various invasive plant species. Invasive species are alien species whose introduction and spread threatens ecosystems, habitats or species with socio-cultural, economic and/or environmental harm, and also poses a risk to human health. The present book aims to provide a critical review on the mechanisms, impact and management of invasive species, particularly in the context of plants.