Meadow knapweed (Centaurea x moncktonii) (photo: Doug Murphy, CC BY-SA 3.0)

Meadow knapweed

Centaurea x moncktonii


  • Native to Southern Europe.
  • Hybrid of black and brown knapweed.
  • Perennial that reproduces by seeds.
  • Flower is purple, blooms July through September.
  • Bracts are brown with a thin fringe. Bracts become shiny as flower matures.
  • Seed heads are rounder than those of spotted knapweed (Centaurea stoebe).
  • Prefers disturbed and moist sites, along roadways, fields, open grasslands and pastures.

Consequences of invasion

  • Foliage is coarse and not palatable to livestock.
  • Outcompetes native grasses and other pasture species.

Status in the CKISS region

  • It is present in the Nakusp Invasive Plant Management Area (IPMA), where the goal is to manage current infestations and prevent this species from spreading beyond its containment area.
  • If you notice this plant growing outside of its containment area, please report it!
  • It has also been found with a very limited distribution in the Creston IPMA, where eradication is the goal and is feasible.
  • To learn more about how CKISS classifies and manages invasive species, see our Invasive Species Priority Lists page.

Integrated pest management options

  • Be PlantWise and avoid growing meadow knapweed in your garden.
  • Hand pull small infestations when soil is moist.
  • Repeated cultivation is effective.
  • Biocontrol agent exists for this species.
  • Annual monitoring is recommended

Additional resources