The Mission of the Yellowstone County Weed Department is to assist the public, private, and other government agencies to manage and control existing noxious weed infestations as well as to prevent new invasive species from infesting Yellowstone County.

Common TansyTanacetum vulgare L.

Photo from Weeds of the West, revised edition

Toxic

Rosette

Stem

Leaf

Bloom

Dormant

Video Supplied By Montana Weed Control Association

Attribute	Description
Toxicity	Can cause abortions in humans if ingested; will cause liver damage in some livestock, but it is largely palatable.
Growth Habit	Perennial, erect, bushy, to 6 feet tall.
Leaves	Dark green, alternate, deeply divided into numerous narrow, toothed leaflets (fern like).
Stem	Purplish red in color.
Flower	Yellow, button-like, without petals, ½ inch across in flat-topped dense clusters.
Roots	Reproduces from roots.
Seeds	Yellowish brown with short 5-toothed crown.
Reproduction	Reproduces by roots and seeds.
Habitat	Generally found along roadsides, waste areas, streambanks, and in pastures throughout most of the U.S. and Canada.
Biological Controls	—
Herbicides	Tordon + 2,4-D, Escort.