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The formation of an urban ecological environment is a local trend of the current time. It is necessary to solve the problems of city landscaping since, at the present stage, the deterioration of the state of green spaces and a decrease in the area that they occupy are observed. The article presents data on the state of tree vegetation in the largest park in Vologda (Vologda Region, Russia). According to the dendrometric assessment results in Mira Park, the number of drawback types in each tree species at a specific diameter of the trunk was revealed. It is worth noting that the most common types of drawbacks in linden trees in Mira Park are mechanical damage and frost cleft. The investigation was carried out based on the "Inventory Survey Procedure for Urban Plantations." Most often, wood drawbacks in this species occur on the trunk diameters in the range from 40 to 52 cm. Based on the bioecological assessment performed in Mira Park, it can be stated that the highest percentage of good tree health status was found in pine -- 67.3%, the highest percentage of satisfactory tree health status was found in elm -- 35.7% and the highest percentage of poor tree health status was found in oak -- 16.1%. According to the results of the investigation, it can be said that most of the tree plants are in good and satisfactory condition. The highest percentage of poor health status was found in tree species such as oak and poplar. There are such common flaws on tree plantations as mechanical damage, a frozen slot, and a curved trunk. The current situation in the biggest park in the city of Vologda is stable. However, to improve the systematic condition, it is necessary to hold some activities that should preserve and diversify the tree and shrub plantations, as well as help to solve existing problems. [ABSTRACT FROM AUTHOR]