Flowering and pollination characteristics of Weigela middendorffiana (Carri`ere) K. Koch when introduced in the north

The article presents the results of studying the peculiarities of flowering and pollination of Weigela middendorffiana (Carrière) by K. Koch in the northernmost conditions of introduction. This species is a valuable ornamental shrub that naturally occurs in the forests of the Far East. Flowers of W. middendorffiana refers to flowers with polychrome corolla color during flowering. The yellow-orange stripe on the lower lobe inside the corolla becomes red-brown after the end of the male and female stages. The duration of the "yellow-orange" phase is from 2 to 5 days, and the "burgundy-red" phase lasts from 1 to 4 days. This species growing in culture\ (under cultivation) in the Middle Taiga subzone of the Komi Republic is characterized by annual secondary flowering. The flower of W. middendorffiana has morphological features that provide preferential pollination by bees and bumblebees. Experience in determining the type of pollination has shown that W. middendorffiana is characterized by xenogamy and there are signs of physiological self-incompatibility.