Centaurea stoebe

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Legend for Species Pages

Spotted Knapweed

Centaurea stoebe L. ssp. micranthos (Gulger) Hayek


Centaurea maculosa auct. non Lam.

Centaurea biebersteinii DC

Acosta maculosa auct. non Holub

  • Moss, Flora of Alberta – Rare
  • Global Invasive Species Database – Yes[1]
  • NatureServe Rank – High
  • Haber, Upland – Minor
  • Haber, Wetland – No
  • CWF, Status & Invasive Range – Potential, BC, SK, AB, MB, ON, QC, NF & Northern NWT, Yukon
  • Alberta Revegetation Guidelines – No
  • The Nature Conservancy – Yes, w/ ESA
  • CBCN – Potential
  • AB Weed – Prohibited noxious


Rare, ISSG for most of Canada, AB included. In sagebrush steppe (Artemisia tridentata), post-fire soil water increases favour Knapweed which once established is able to draw moisture from greater depths and permanently reduce soil moisture below levels normal prior to infestation.

[[2]]Link to Global Invasive Species Database "Centaurea biebersteinii is a biennial or short-lived perennial composite and a very aggressive invader. It has been reported to grow on a wide variety of habitats, especially industrial land..."

[3] Link to Bugwood Invasipedia for extensive information on biology, ecology, and management of this species.

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Roché C.T., and B.F. Roché Jr. 2000. Identification of Knapweeds and Starthistles in the Pacific Northwest: PNW432. Pacific Northwest Extension Publication. 22 pp. [4]

Alberta Invasive Plant Council factsheet: https://www.invasiveplants.ab.ca/Downloads/FS-SpottedKnapweed.pdf