This edition is a lecture course prepared for students of biological specialties. In it from ecological and hydrobiological positions questions of classification and the description of coastal-water plants in reservoirs, methods of gathering, mapping, definition of biomass and production of plants are considered. The trophic and ecological role of plants in the system of water biocoenosis is considered. The special attention is given to a role of coastal-water plants in self-cleaning of reservoirs, an estimation of degree of pollution of waters on indicator plants, protection and rational use of coastal-water plants, their cultivation, restoration, etc. Ways of cultivation of aquarium and ornamental water plants are described. The book is intended for students-hydrobiologists, students of other biological and ecological specialties, teachers and schoolchildren, specialists working in the field of ecology and environmental protection, ornamental landscape science.This book has been translated with Artificial Intelligence.