Canada Thistle

( Cirsium arvense )

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Type	Information
Toxicity	Non-toxic.
Control	Cutting or mowing, biological, re-vegetation (competing crops) and herbicide. Contact your County Weed District or local Applicator for more information.
Habitat	Wetter habitat or disturbed ground, including ditch banks, overgrazed pastures, tilled fields or abandoned sites.
Root	Extensive vertical and creeping horizontal roots.
Leaf Shape	Lance-shaped and shallow-lobed.
Lifespan	Perennial; two years or longer.
Priority 2B Weed	Abundant in Montana and widespread in many counties.
Similar Looking Plants	Wavy leaf and bull thistles.
Important Information	Hard to manage due to extensive nutrient stores and root systems; combinw integrated weed management (IWM) for effective control. The root system accounts for much of the re-establishment of the plant.