Common knotweed

Introduced to Québec. Grows in fields and in urban areas.

There are 4 observations of Common knotweed in Québec, mostly in Gaspésie–Îles-de-la-Madeleine, Bas-Saint-Laurent and Capitale-Nationale, and it has been reported in 4 of the 17 regions. They peak in August and September and become rare from November to May.