Photographs: Bandon, Co. Cork

Giant Knotweed Reynoutria sachalinensis (Fallopia sachalinensis) Glúineach chapaill Family: Polygonaceae Flowering: August-September. Perennial. Introduced. Panicles of greenish-white flowers, but flowering is very infrequent. The very large leaves are heart-shaped and pointed and the very stout stems are reddish-brown. Height to 3m+. It is taller but less vigorous and much less widespread than Japanese Knotweed with which it can hybridise. Occasonally found on waste ground, roadsides and river banks

Giant Knotweed, Reynoutria sachalinensis, Glúineach chapaill