Calendar of flowering of woody plants in the Polar Alpine Botanical Garden-Institute named after N. A. Avrorin

The information about the timing and duration of flowering of woody plants makes it possible to plan the landscaping so that the plantings are the most decorative. Trees and shrubs are the most decorative during their blooming. The article presents key data on the flowering of woody plants in the Polar Alpine Botanical Garden-Institute (PABGI). The objects of the study were trees and shrubs in the PABGI collection fund. The material of the work was the data of phenological observations for the period from 2001 to 2020. We studied the beginning and duration of the growing season, the duration of the prefloral period, the timing, duration and abundance of the flowering. Trees and shrubs in the PABGI collection are characterized by an early beginning and a short duration of the growing season, a short and medium duration of the prefloral period. Early flowering in the second half of May is typical for wind-pollinated and flowering before leaf-out plants. The mass flowering of trees and shrubs is observed in the second decade of June and the first decade of July. Woody plants with a long prefloral period and long-blooming plants flower in August and September. Most trees and shrubs bloom within 6-10 or 11-15 days. The abundance of flowering is rated from moderate to excellent.