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Annual Bluegrass
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Field Guide to Noxious and Other Selected Weeds of British Columbia

Diffuse Knapweed
(Centaurea diffusa)

  • Provincial Noxious Weed

  • biennial to short-lived heavily branched taprooted perennial growing from 0.6 to 1 metre in height; divided leaves grayish-green in colour, hairy; very bitter to the taste

  • white, occasionally purple flowers; bracts of the flowerheads with small, sharp, rigid spines

  • one of 13 "knapweed" species in British Columbia
Rigid spines on tips of flower bracts
Bolting plant

More information on knapweed
Return to Field Guide to Noxious and Other Selected Weeds of BC