Abstract Synergistic effect of new plant growth regulators Ivin, Methyur, Kamethur and microfertilizers Rostok Extra and Radix Tim forte plus on the growth of shoots and roots of winter canola (Brassica napus L.) cultivar Sherpa was studied. Auxin IAA served as a standard for studying plant growth regulating activity. The highest rates of growth of shoots and roots of canola plants were obtained when the seeds were treated with plant growth regulators Methyur and Kamethur, or microfertilizers Rostock extra and Radix Tim forte plus, or a complex of plant growth regulators with microfertilizers: Ivin+Rostok extra, Ivin+Radix Tim forte plus, Methyur+Rostok extra, Methyur+Radix Tim forte plus, Kamethur+Rostok extra, Kamethur+Radix Tim forte plus. The plant growth regulating activity of Ivin Methyur, Kamethur and microfertilizers Rostok Extra and Radix Tim forte plus was similar or higher than that of auxin IAA. It was concluded that the synergistic effect of plant growth regulators Ivin, Methyur, Kamethur and microfertilizers Rostok Extra and Radix Tim forte plus on improving the growth of shoots and roots of canola plants is due to their auxin-like effect on the activation of processes of elongation, division and differentiation of plant cells, formation and growth of plant tissues and organs, as well as improvement of metabolic processes in plant cells.