Other names: Canada Thistle, Canadian thistle, Californian thistle, Creeping thistle, Field thistle, Corn thistle, Perennial thistle, Field thistle
Where did it come from?
Most invasive thistles came from Europe in the 1600s. The exact means of introduction are largely unknown, but it is speculated that they were brought over in farm seeds.
Why is it invasive?
Invasive thistles can decrease crop yields and reduce forage. These thistles also out compete native plants that animals rely on for food and shelter.
How do you prevent its spread?
Long term, consistent management can reduce the number of thistles and seeds in fields. In addition, checking field clothes and equipment for seeds before moving to a new area can reduce the spread of these plants.
Resources:
♦ Control Practices for Canada Thistle
♦ Bull and Musk (Biennial) Thistle Control in Perennial Grass Crops
♦ Species assessment spiny plumbless thistle
♦ Species assessment musk thistle
♦ Species assessment Canada thistle
♦ Species assessment bull thistle
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Image credit: Dennis Jarvis