Common Names Canada thistle
Family Composites, Sunflower
Flower Color Purple
Plant Type Herb
Short Description Perennial, deep-seated creeping underground roots. Leaves: Spiny, pinnatifid
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.