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Cirsium arvense Common Names Canada thistle Family Composites, Sunflower Flower Color Purple Plant Type Herb Short Description Perennial, deep-seated creeping underground roots. Leaves: Spiny, pinnatifid Location McCall Native No Weed Noxious |
Canada thistle produces a lot of bristly-plumed seeds. These seed spread by the wind. Canada thistle is a noxious weed, partly because it has aggressive sprouting from its perennial root system.