Terms of flowering of introduced woody plants in the arctic zone of Russia (Kola peninsula)

The study was carried out in the collection of introduced woody plants of the Polar Alpine Botanical Garden-Institute. The objects of study were 430 samples of 255 taxa of introduced woody plants. The features of flowering of woody deciduous plants are determined, consisting in the regularity, timing and duration of flowering, the duration of the prefloral period. Vegetation begins early, specimens with a short vegetation period predominate. The predominant number of analyzed plants blooms, 65.3% of deciduous introduced plants were classified as irregular bloomers. A short prefloral period was noted for wind pollinated and early flowering accessions. A long prefloral period is observed in flowering species in the second half of summer. Most plants are characterized by a prefloral period of medium duration. The mass onset of flowering in introduced trees and shrubs was noted from the second decade of June to the first decade of July. Most flowering plants are characterized by an abundance of flowering from medium to very abundant. In 78% of plants, the phenophase “beginning of leaf opening” is observed in the second half of May. Autumn foliage color is fixed from August 3 to October 14. Leaf fall takes place from September 5 to October 23. The duration of foliage is on average 130 days. Leaf fall takes place from September 5 to October 23. The duration of foliage is on average 130 days. Leaf fall takes place from September 5 to October 23. The duration of foliage is on average 130 days.

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