Common Tansy

Asteraceae or Sunflower Family
Tanacetum vulgare

Growth Habit:
Perennial, grows in thick stands.
Leaves: Alternate, deeply divided into several toothed segments, 2-dimensional.
Stems: Purplish-red color, 1.5 to 6 feet tall.
Flowers: Yellow, 1/4 to 1/2 inch in diameter, flat topped, dense clusters, button-like, and aromatic.
Roots: Extensive, rhizomatous root stalks.
Seeds: Prolific seed producer.
Reproduction: Root stalk and from seed.
Habitat: Roadsides, waste areas, stream banks, and pastures.

Handpulling: Only effective on small infestations if it successfully removes the rhizomes. Multiple treatments will be necessary in order to deplete the seed bank and eradicate the infestation.
Mowing: Should be done prior to flower in order to reduce seed production. If mowing is utilized, blades should be set at a height of greater than 4 inches in order to minimize the damage to competitive, desirable vegetation.
Biological Control: N/A
Grazing: Sheep have been used in Montana to graze common tansy, and they are an effective method of removing above ground plant materials, thus reducing seed production. Other forage species should be available and sheep should be taken completely off of common tansy infestations at least four weeks prior to birthing, as common tansy does contain toxins that have been shown to cause abortions in livestock.
Herbicide: The following herbicides are labelled for control of common tansy. Always consult product labels and read them carefully to ensure correct species/land management usage and chemical application.

Trade Name: Active Ingredient: Rate: Efficacy: Comments:
Escort metsulfuon .5-1 oz/acre most effective if applied during bolt or bud stages Cannot be used near wells, surface water or shallow ground water
Telar chlorsulfuron .5-1 oz/acre most effective if applied during bolt or bud stages
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