Abstract. This paper presents the results of the study of squares vegetation ecological state in Ulan-Ude based on the results of green spaces inventory (20162018). The data were obtained on the species diversity and structure of urban green spaces. The families of Rosaceae (12) and Pinaceae (5) are represented to the greatest extent in the studied squares. In quantitative terms plantations of squat elm (Ulmus pumila L.), balsam poplar (Populus balsamifera L.), ash maple (Acer negundo L.) and berry apple (Malus baccata (L.) Borkh.) predominated in the squares of Ulan-Ude. The analysis of the assortment composition of Ulan-Ude squares showed that it was quite poor. The age structure of existing plantations on the territory of the studied squares varies widely; a significant part of the plantations is approaching the age of its physiological old age. During the research period the quality of flower beds and lawns was assessed at landscaping facilities. At the present moment their condition is improving due to the improvement in the quality of nursing work. An indicator of the total projective cover was determined at the grassy layer. The obtained data on the vegetation state indicate that the state of plantings is weakening in most of the studied squares. The study results can serve as the basis for further monitoring of Ulan-Ude green areas.

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