| Common Name: | Canada thistle |
| Family: | Asteraceae |
| Genus: | Cirsium |
| Species: | arvense |
| Classification/Rank: | Very Invasive |
| Method of Transportation: | A single seedling can produce a large patch through vegetative propagation |
| Habitat/Range: | Mesic to dry roadsides, fields and disturbed areas in the lowland, steppe and montane zones |
• biennial herb that grows 0.3 to 2.0 m tall • stems are erect, branched, and hairy •leaves are irregularly toothed, alternate, lance shaped on the lower stem becoming broader upwards, spiny toothed, smooth and green above, densely white hairy below • flowers are pink-purple
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