 Steve Dewey, Utah State University, Bugwood.org | Canada Thistle (Cirsium arvense) is an invasive weed. Canada thistle crowds out and replaces native plants, changes the structure and species composition of natural plant communities and reduces plant and animal diversity. This highly invasive thistle prevents the coexistence of other plant species through shading, competition for soil resources and possibly through the release of chemical toxins poisonous to other plants. . |
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