Common Tansy


  • Stems reddish-purple
  • Crushed leaves strongly aromatic; furry on the underside and smooth above
  • Bright yellow button-flower clusters
  • Height 1 to 6 feet

Weed Pictures

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Weed Information

ToxicityCan cause abortions in humans if ingested; will cause liver damage in some livestock, but it is largely palatable.
ControlMechanical and herbicide. Contact your County Weed District or local Applicator for more information.
HabitatFull sun and moist habitats along stream banks, irrigation ditches, trails and roadsides, lawns and gardens, waste areas, vacant lots and pastures.
RootExtensive, spreading root system.
Leaf ShapeAlternate on stem and fern-like.
LifespanPerennial; two years or longer.
Priority 2B WeedAbundant in Montana and widespread in many counties.
Similar Looking PlantsTansy ragwort and camphor tansy.
Important InformationOften still planted and cultivated as an ornamental. Also can be used as a natural insect repellent.