Spotted Knapweed


  • In early stages of growth, gray-green leaves are deeply lobed with short, thin, grayish hairs
  • A single pink to purple flowerhead at end of stem; racts at the base of flower fringed with short hairs and black on the tips
  • Height up to 6 feet

Video Information

Weed Pictures

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Weed Information

ControlHand pulling or digging using gloves, biological, herbicide and mechanical. Contact your County Weed District or local Applicator for more information.
HabitatRangelands, disturbed areas, meadows, pastures, roadsides and sandy or gravelly floodplains.
Leaf ShapeRosette leaves deeply lobed, linear mature leaves.
LifespanBiennial or short-lived perennial.
Priority 2B WeedAbundant in Montana and widespread in many counties.
Similar Looking PlantsRosette leaves deeply loped, linear mature leaves.
Important InformationPlants are suspected to contain toxins that inhibit the growth of neighboring plants. Seeds remain viable in the soil for up to eight years.