Introduction of Crataegus L. samples in the Kola North

The paper deals with the introduction of genus Crataegus L. samples in Polar-Alpine Botanical Garden-Institute. The paper presents long-term periods of phenological phases onset of 14 Crataegus L. samples. Features of generative phenological development of 11 Crataegus L. samples are described. In the introduced Crataegus L. plants the time for the phenological phases passage depends on the origin and age. Adaptive advantages are plants of natural origin. This category of samples record phenophases of linear growth and lignifications of annual shoots which favorably affects the degree of adaptation. The phenophases onset of the majority of plants of the older and younger age groups is noted at close time. In plants of the older age group the phases of linear growth end and shoots’ lignifications are marked earlier than those of 18-19-year-olds. The indicators characterizing generative development (the duration of the prefloral period, flowering) are appropriate when assessing the adaptability of introduced plants. The majority of the samples are characterized by regular flowering and fruiting. The studied plants belong to the group with the average flowering onset. Short prefloral period contributes to early start and flowering end, earlier ripening of.