Prepared by Jennifer L. D’Appollonio, Assistant Scientist, University of Maine, Orono, ME 04469. September 2011.
Scientific name: Cirsium arvense (L.) Scop.
Common name(s): Canada thistle, Canadian thistle, creeping thistle, cursed thistle
Images: (to see enlargements [PC]: click on image, then right click and choose “view image”)
-leaves are alternate on the stem
- spiny and lobed
-generally flowers July through August in ME
-native to Europe
- introduction due to farm seed shipments
-crowds native species
-reduces crop and forage yields
Heinrich, B. 1976. Flowering phenologies: Bog, woodland, and disturbed habitats. Ecology. 57(5):890-899.
National Invasive Species Information Center. “Canada Thistle.” Terrestrial Plants, USDA, 2020, www.invasivespeciesinfo.gov/terrestrial/plants/canada-thistle.