Canada Thistle (Cirsium arvense)

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  • A perennial that spreads by roots and seeds
  • Grows 1 to 4 feet tall
  • Has clusters of small, white to purple flowers at the end of the stems
  • Leaves are very spiny - it hurts to touch this weed!
Flower
(click for larger view)

Plant
  • Grows in moist and disturbed sites
  • This invasive weed is very aggressive and difficult to control
  • Pulling and burning do not control this weed, as they favor root resprouting
  • Chemical controls are needed
    		•
    Please click on any picture for a larger view.
    Infestation


    Sue Donaldson
    University of Nevada Cooperative Extension
    5305 Mill St. Reno, NV 89502
    (775) 784-4848  Email: sue@washoeweeds.org

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