Photographs: Bandon, Co.Cork
Panicles of greenish-white flowers, but infrequently flowering.
Very large leaves, heart-shaped, pointed. Very stout reddish-brown stems.
Height: To 3 m+. Taller but less vigorous than Japanese Knotweed.
Waste ground, roadsides, river banks. Garden escape.
Less widespread than Japanese Knotweed with which it can hybridise.
Photographs above: Bandon, Co.Cork. August 2007