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Family: asteraceae
Common name(s): Canada thistle
Synonym(s): Breea arvensis
Hardiness ratings: USDA zone 3~4 - 7 
General resources
Links for Cirsium arvense
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 3-7a)
 (10 photos)
- Garden.org - Community-assembled plant profile (14 photos)
- Illinois Wildflowers - Informative illustrated page with description and cultivation details, also covering range and faunal associations. (3 photos)
- Missouri Plants - Description and photographs of botanical features, with notes about habitat and native status. (9 photos)
- North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 4-7) (3 photos)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. (1 photo)
- Southwest Colorado Wildflowers - Photos and botanical information about the species/genus. (7 photos)
- Turner Photographics - Profile of wildflower of the US Pacific Northwest, with botanical description, habitat and distribution, and photo gallery.
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