Common Tansy

common tansy leaf
common tansy habit
common tansy flower

Common Tansy

Tanacetum vulgare

Information Sheet (PDF)


Colorado List B - Eradication required in Jefferson County


General

  • Family: Sunflower (Asteraceae)
  • Introduced from Eurasia


Common names

  • Bitter Buttons, Mugwort, Golden Buttons


Habitat

  • Colony forming
  • Found in fields, roadsides, disturbed sites
  • Has been sold as an ornamental
  • Perennial forb


Plant


Vegetation

  • 2 to 5 feet tall
  • Alternate on stem
  • Deeply lobed leaves 6 inches wide and 12 inches long
  • Strong smell when crushed


Roots

  • Rhizomes with wiry roots


Flower

  • ¼  to ¾ inch wide
  • 20 to 200 button shaped flowerheads in groups at end of stems
  • June to August
  • Yellow


Seed

  • 2,500 plus per plant


Seedling

  • Spring


Reproduction

  • Seed
  • Rhizomes


Control


Biological

  • None


Chemical


Cultural

  • Prevention
  • Removal - make sure the entire rhizome is removed. Must be repeated as new plants germinate


Mechanical

  • Burning - N/A
  • Grazing - N/A
  • Mowing - Prior to bloom, works best when combined with herbicide treatments


Use all chemicals according to the manufacturer's label. No specific recommendation or endorsement is made or implied by listing methods or products.