Betula populifolia

Japanese Knotweed Alliance Japanese Knotweed Alliance- Information on the problem of Japanese knotweed and the concept of natural (biological) control using FAQs, links and updates. Fallopia japonica Fallopia japonica- Photographs and information on Japanese Knotweed. Sometimes classified as Reynoutria japonica or Polygonum cuspidatum. Polygonum cuspidatum - Japanese Knotweed Polygonum cuspidatum - Japanese Knotweed- Photograph and technical information on this invasive shrubby plant, its description, economic importance, distribution, biology and cont…