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Giant knotweed

• University of Idaho - 21 New Noxious Weeds in Idaho - Giant knotweed (2MB PDF File)
• USDA Natural Resources Conservation Service - Giant knotweed
• Washington State Noxious Weed Control Board - Giant knotweed
• Also see the Giant knotweed photo gallery and information in the Virtual Field Guide - Noxious Weed List section.