Polygonum Polygonum cuspidatum
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Fallopia japonica - Photographs and information on Japanese Knotweed. Sometimes classified as Reynoutria japonica or Polygonum cuspidatum.
Japanese Bamboo or Japanese Knotweed: Polygonum cuspidatum - Photographs of this perennial plant, with its description and identifying characteristics.
Japanese Knotweed Alliance - Information on the problem of Japanese knotweed and the concept of natural (biological) control using FAQs, links and updates.
Polygonum cuspidatum - Japanese Knotweed - Photograph and technical information on this invasive shrubby plant, its description, economic importance, distribution, biology and control. Help build the largest human-edited directory on the web.