Photographs: Bantry, Co.Cork
Spikes of white flowers. Reddish zig-zag stems. Broad leaves, oval-triangular, pointed. Spreads rapidly by rhizomes, forms large thickets. Height: To 2m
Roadsides, wasteland, streamsides. Widespread and very invasive introduction, difficult to eradicate. Originally introduced as garden plant. Designated as a significant invasive plant in Ireland: Managing Invasive Alien species
Similar: Giant Knotweed, F. sachalinensis.
Photographs above: Bantry, Co.Cork. September 2006