Common Tansy- This pungent perennial grows up to 5' tall and spreads via wind-dispersed seeds, as well as by rhizomes.
Leaves: Alternate and pinnately compound, they are deeply divided into toothed segments and become smaller towards the top of the stalk.
Flowers: Flowers bloom from July to October. Numerous clusters of button-like yellow flowers that have a flat top and are 1/4 to 1/2 inches wide.
Habitat: It is extremely common to find along roadsides, waste areas, stream banks and in pastures.
Weed Classification: B
Why is it a Noxious Weed?
Because of its aggressive nature and risk of toxicity to livestock. Like most other noxious weeds, it can displace good forage and reduce/jeopardize wildlife habitat.
This species is widely distributed throughout Lewis, and neighboring, Counties. The creation of containment areas is being evaluated.