The relevance of the research is due to the active introduction of new tree species into the urban environment, as well as to the increasing anthropogenic load. In connection with this, monitoring studies of tree plantations are necessary. This article presents the results of a comprehensive assessment of the species composition and sustainability of the tree plantations in Orel. The leading methods were the route method with the use of photography and herbarium of woody plants, as well as methods of visual estimation of tree plantations. As a result of the research, 179 species and hybrids, as well as 27 forms and varieties of wood plants were identified. A systematic and biomorphological survey of tree flora is given. 71.51% of the species are introduced and 28.49% are wild. 15 792 trees belonging to 35 species are analyzed on the examined 36 objects of landscape architecture. The ecological, biomorphological and age characteristics of these species are given. It was revealed that the tree plantations of general and limited use of Orel are weakened. The materials of the article are of practical value for substantiating the necessary measures for the reconstruction and restoration of green plantings in the objects of landscape architecture of Orel.