Diffuse Knapweed


  • Robust, bushy plant, generally shorter than spotted knapweed
  • Stems, leaves and flower head bracts covered in hairs
  • Pale, gray-green leaves smaller and less divided further up the stem
  • White to pink flowers
  • Height 1 to 3 feet

Video Information

Weed Pictures

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Weed Information

ControlMechanical, herbicide and biological. Contact your County Weed District or local Applicator for more information.
HabitatCommon in disturbed habitats and overgrazed or poorly managed pastures.
RootDeep taproot.
Leaf ShapeLower leaves deeply lobed, upper leaves linear.
LifespanAnnual, biennial or short-lived perennial.
Priority 2B WeedAbundant in Montana and widespread in many counties.
Similar Looking PlantsNative purple asters, other knapweeds.
Important InformationSpreads only by seed; found at elevations up to 7,000 feet.