Tansy Ragwort

Senecio jacobaea

Branching flower stalks with bright yellow flowers; leaves are dark green and deeply lobed.

Life Forms	Forb
Habitats	Farm fields Forest openings Gardens Little Habitats Pastures Rangelands Residential yards Riparian areas
ODA Listing	B
Soil and Moisture Conditions	Moist Well drained
Suggested Actions	Use BMPs to control on private property
Shade Preference	Full sun Part shade
Mature Height	up to 6'
Distribution	Widespread through western Oregon with more limited distribution in eastern Oregon.
Control	Biological control agents are well established. Hand pulling is only effective on small populations during the first year of growth. Mowing may stimulate multistemmed growth. Follow all label directions when using chemicals
Reproduction and Spread	A single plant can produce up to 200,000 seeds that can remain viable up to 15 years.
Introduced	This plant is native to Europe and western Asia. It was first documented in Multnomah County in 1922.
Look Alikes	common tansy
Impact	Plants are poisonous to livestock and often thrive in pastures
More Info	https://www.oregon.gov/oda/shared/Documents/Publications/Weeds/TansyRagwortProfile.pdf https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/ec1599.pdf