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Japanese Knot Weed is a vigorous invasive species growing 6 to 9 feet annually and outcompeting ...
Japanese Knot Weed is a vigorous invasive species growing 6 to 9 feet annually and outcompeting most native species. Removal is extremely expensive. Photo by Britt Slattery, U.S. Fish and Wildlife Service.
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Last updated: February 09, 2010