Invasive Plants of Ohio: Fact Sheet 10 - Japanese Knotweed (PDF | 254 KB)
Ohio Invasive Plants Council.
Included as one of the worst invasive plant species in Ohio's natural areas; for others see Invasive Plants of Ohio.
Southeast Exotic Pest Plant Council Invasive Plant Manual - Japanese Knotweed
Southeast Exotic Pest Plant Council.
Fact Sheet: Japanese Knotweed (Jan 2014; PDF | 874 KB)
Alberta Invasive Plants Council (Canada).
Alaska Exotic Plants Information Clearinghouse (AKEPIC): Species Biography - Japanese Knotweed, Giant Knotweed, Bohemian Knotweed (Feb 7, 2011; PDF | 304 KB)
University of Alaska - Anchorage. Alaska Center for Conservation Science.
See also: Non-Native Plant Species List for additional factsheets (species biographies) and species risk assessment reports of non-native species present in Alaska and also non-native species currently not recorded in Alaska (potential invasives).
Invasive Plant Atlas of New England (IPANE) - Japanese knotweed, Mexican bamboo
University of Georgia. Center for Invasive Species and Ecosystem Health.
Invasive Plant Atlas of the United States - Japanese
University of Georgia. Center for Invasive
Species and Ecosystem Health.
Invasive Species Compendium - Fallopia japonica
Japanese Knotweed Alliance
Delivering Alien Invasive Species Inventories for Europe (DAISIE): Species Factsheet - Fallopia japonica
European Commission. Sixth Framework Programme.
Great Britain Non-Native Species Secretariat.
Global Invasive Species Database - Fallopia japonica (herb, shrub)
IUCN. Species Survival Commission. Invasive Species Specialist Group.
Germplasm Resources Information Network (GRIN) - Reynoutria japonica
USDA. ARS. National Genetic Resources Program.
Fire Effects Information System (FEIS) - Polygonum sachalinense, P. cuspidatum, P. × bohemicum
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.
PLANTS Database - Japanese Knotweed
USDA. NRCS. National Plant Data Center.
Weeds in Australia -
Japanese Knotweed (Fallopia japonica)
Australian Government. Department of the Environment.
Cornwall County Council (United Kingdom).
Encycloweedia: Data Sheet - Fallopia genus
California Department of Food and Agriculture.
Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources.
Noxious Weed Species - Japanese, Giant, and Bohemian Knotweeds
Colorado Department of Agriculture. Conservation Services Division. Noxious Weed Program.
Japanese Knotweed - Invasive Plant Species Fact Sheet (PDF | 734 KB)
Indiana Department of Natural Resources. Invasive Plant Species Assessment Working Group.
Invasive Species Best Control Practices - Japanese Knotweed (2012; PDF | 2.30 MB)
Michigan Department of Natural Resources. Michigan Natural Features Inventory.
Japanese Knotweed (May 2011; PDF | 671 KB)
Missouri Department of Conservation.
Invasive Plants in Pennsylvania: Japanese Knotweed and Giant Knotweed (PDF | 162 KB)
Pennsylvania Department of Conservation and Natural Resources.
Japanese Knotweed - Vermont Invasive Exotic Plant Fact Sheet (PDF | 94 KB)
Vermont Agency of Natural Resources. Environmental Conservation.
Japanese Knotweed - Non-Native Freshwater Plants
Washington State Department of Ecology. Water Quality Program.
B Noxious Weed: Japanese Knotweed
Washington State Noxious Weed Control Board.
King County (Washington). Noxious Weed Control Program.
Japanese Knotweed (Polygonum cuspidatum)
Wisconsin Department of Natural Resources.
Japanese Knotweed (Polygonum cuspidatum) (2007; PDF | 117 KB)
Purdue University (Indiana). Extension.
Maine Invasive Plants Bulletin: Japanese Knotweed / Mexican Bamboo
University of Maine Cooperative Extension.
See also: Maine Invasive Plants & Entire Series for entire series of 22 fact sheets and invasive plants brochure (available in HTML/PDF or for purchase)
Invasive, Exotic Plants of the Southeast - Japanese Knotweed
North Carolina State University. Cooperative Extension. Going Native: Urban Landscaping for Wildlife with Native Plants.
Introduced Species Summary Project - Japanese Knotweed
Columbia University. Center for Environmental Research and Conservation.
Ohio Perennial & Biennial Weed Guide - Japanese Knotweed
Ohio State University. Ohio Agricultural Research and Development Center.
Fact Sheet: Japanese Knotweed (PDF | 367 KB)
Pennsylvania State University. Pennsylvania Sea Grant.
Invasive Plants and Insects: Japanese and Giant Knotweed
Pennsylvania State University. Cooperative Extension.
BioBullies - Japanese Knotweed
Natural Biodiversity (Western Pennsylvania).
Plant Conservation Alliance. Alien Plant Working Group.