Features of vegetation, flowering and fruiting of the genus Spiraea L. species in the cultivation in the European North-East (Republic of Komi)

The paper deals with the flowering and fruiting of introduced species of Spiraea L. genus in the collection of the Botanical garden of the Institute of biology of Komi SC of Ural branch of RAS, located in the middle taiga subzone of the European North-East of Russia. The collection of Spiraea genus by this time includes more than 40 taxa of plants of different geographical origin, including one species of local flora. Characteristics of vegetation, flowering and fruiting indicators of nine species of perennial plants of the genus are given based on the results of phenological observations during five years. It is shown that the seasonal rhythm of plant development in the new conditions corresponds to the climatic conditions of the subzone of the middle taiga. There are differences in the dates of beginning and duration of flowering in different species Spiraea of three sections, the total duration of flowering of studied species is almost 100 days. The species of Spiraria section are characterized by latest start and a long flowering period. Plants of all studied species are characterized by annual flowering and fruiting with the formation of benign seeds; some species are capable of self-seeding. The revealed characteristics allow us to consider that the studied species of Spiraea genus have successfully adapted in the Northern region and can be used in ornamental horticulture.