Invasive Plants of California's Wildlands - Cirsium
California Invasive Plant Council.
Bossard, C.C., J.M. Randall, and M.C. Hoshovsky (Editors). 2000. Invasive Plants of California's Wildlands. University of California Press. Berkeley, CA.
Invasive Plants of Ohio: Fact Sheet 14 - Canada Thistle (PDF | 214 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.
Fact Sheet: Canada Thistle (Jan 2014; PDF | 481 KB)
Alberta Invasive Plants Council (Canada).
Federal Noxious Weed Disseminules of the U.S. - Fact Sheet: Cirsium arvense
USDA. APHIS. PPQ. Center for Plant Health Science and Technology; California Department of Food and Agriculture.
Alaska Exotic Plants Information Clearinghouse (AKEPIC): Species Biography - Canada Thistle (Feb 7, 2011; PDF | 142 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) - Canada thistle
University of Georgia. Center for Invasive Species and Ecosystem Health.
Invasive Plant Atlas of the United States - Canada
University of Georgia. Center for Invasive
Species and Ecosystem Health.
Invasive Species Compendium - Cirsium arvense
Global Invasive Species Database - Cirsium arvense (herb)
IUCN. Species Survival Commission. Invasive Species Specialist Group.
Germplasm Resources Information Network (GRIN) - Cirsium arvense
USDA. ARS. National Genetic Resources Program.
Fire Effects Information System (FEIS) - Cirsium arvense
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.
PLANTS Database - Canada Thistle
USDA. NRCS. National Plant Data Center.
Weeds in Australia -
Perennial Thistle (Cirsium arvense)
Australian Government. Department of the Environment.
Encycloweedia: Data Sheet - Cirsium genus
California Department of Food and Agriculture.
Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources.
Noxious Weed Species - Canada Thistle
Colorado Department of Agriculture. Conservation Services Division. Noxious Weed Program.
Invasive Plants in Pennsylvania: Canada Thistle (PDF | 576 KB)
Pennsylvania Department of Conservation and Natural Resources.
C Noxious Weed: Canada Thistle
Washington State Noxious Weed Control Board.
Wisconsin Department of Natural Resources.
Colorado State University. Cooperative Extension.
- Noxious Weeds of Nebraska (May 2009; PDF | 941 KB)
University of Nebraska - Lincoln. Cooperative Extension.
Ohio Perennial & Biennial Weed Guide - Canada Thistle
Ohio State University. Ohio Agricultural Research and Development Center.
Noxious Weed Information - Canada Thistle (B List)
Colorado Weed Management Association.
Weed Identification - Canada Thistle
Montana Weed Control Association.
BioBullies - Canada Thistle
Natural Biodiversity (Western Pennsylvania).
Plant Conservation Alliance. Alien Plant