Phenology of rowan in the Mari El Republic conditions

The results of phenological observations of 2014-2017 for 4 species of mountain ash in the Mari El Republic conditions are presented. Species vegetated from the end of April to the end of September - beginning of October. Flowering took place from the third decade of May to the first decade of June in a relatively short time. Fruits of different species ripened at different times: at the earliest, in the first half of August - S. amurensis, at the latest, in the first decade of September - S. aria.