Irish wildflowers sitemap
Photographs: Bantry, Co.Cork 
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Japanese Knotweed 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. 
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Photographs above: Bantry, Co.Cork. September 2006
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