THE BIOLOGY OF CANADIAN WEEDS: 19. Asclepias syriaca L.

Abstract

This summary of biological data is for common milkweed (Asclepias syriaca L.), as a weed in Canada, particularly in eastern Canada. Weedy populations of this perennial occur in great abundance in southern Ontario and Quebec. It belongs to association of plants of roadsides, waste lands and river basins. Recently, this weed has spread into cultivated lands, especially cereals, row crops and forage crops.