Introduction species of the genus Eupatorium L. in the southern taiga subzone of Western Siberia.
The article contains results of six years of observations of introduced populations of Eupatorium cannabinum L., E. maculatum L., E perfoliatum L. and E purpureum L. Seasonal rhythms of development are revealed, some antecological features are investigated, elements of seed productivity are counted and laboratory germination of seeds is estimated. It is established that the studied species are in the full cycle of seasonal development in the southern taiga subzone of Western Siberia: all species are stable vegetate, bloom and bear fruit. Plants are referred to a group of long-term vegetation and summer flowering period cultures. It was found that the flowers of the Eupatorium are characterized by dichogamy in the form of protandry. Species are inherent by high coefficients of seed productivity and fertility of pollen grains. Size indicators of seeds and pollen grains are stable, have a low level of coefficient of variation. Stratification increases the germination of seeds in two times. The studied species can be recommended for use in mixborders, various compositions of landscape style, in the design of garden reservoirs.