Tansy Ragwort


  • Dark green leaves on top with whitish-green under sides; lower leaves have white. cobwebby hairs
  • Flower in clusters on stout, leafy elongated stems
  • Numerous bright-yellow flowers; each flower has approximately 13 petals
  • Height 3 to 6 feet

Video Information

Weed Pictures

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Weed Information

ToxicityToxic. All livestock, most especially cattle and horses.
ControlHand-pulling, biological and herbicide. Contact your County Weed District or local Applicator for more information.
HabitatGrasslands, disturbed areas, forests, pastures, rangelands and clear-cuts.
RootTaproot with some lateral roots.
Leaf ShapeDeeply lobed with ruffled edges.
LifespanBiennial; two years to complete life cycle.
Priority 2A WeedCommon in isolated areas of Montana.
Similar Looking PlantsSt. Johnswort and groundsel.
Important InformationTansy can re-grow if the roots are broken off or anytime the plant is cut. Covering the site with mulch will help prevent new germination. Leaves produce strong odor when crushed.