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​Terrible 10 - Tansy

Tansy ragwort

Tansy ragwort (Senecio jacobea)

  • Found in open pastures, roadside areas, ditches, clearcuts.
  • Biennial, first year growth is a ruffled, rosette, second year sends up one or more stalks 1-6 ft high. Leaves lobed and deeply cut, dark green above and lighter underside. Bright yellow flowers like small daisy with a yellow button and 13 small petals appear in late summer; common tansy is a close relative but flowers have no petals.
  • Native to Europe, first found here 1920’s, believed to be from contaminated hay.
  • Toxic to cattle and horses causing irreparable liver damage. Seeds can last 15 years so infestations require continual monitoring.