The paper deals with the biological features of introduced species of Cotoneaster genus in the middle taiga subzone of the Komi Republic. The vegetation, flowering, fruiting, rhythm of shoots growth, winter resistance and seed productivity of six species of perennial plants of the genus Cotoneaster in new growth conditions were studied. The seasonal rhythm of development of all studied plant species at the point of introduction corresponds to the climatic conditions of the middle taiga subzone. The most promising species were selected for cultivation.