Field Guide to Noxious and Other Selected Weeds of British Columbia

Canada Thistle
(Cirsium arvense)


  • Provincial Noxious Weed

  • creeping rooted perennial growing erect to 1.2 metres; stalkless dark green leaves with irregular spiny lobes; flowerheads spineless and small compared to other thistles; flowers variable in colour from rose-purple to pink to white.

  • only thistle with male and female flowers on separate plants
Flowerheads with spineless bracts
Seedling
Young rosette

More information on Canada thistle (Weeds BC)

Return to Field Guide to Noxious and Other Selected Weeds of BC


 

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