Photo credit: Daniel Laubhann
Bighead knapweed is native to Eastern Europe and was introduced to North America as an ornamental garden plant. Its earliest confirmed sighting in North America was recorded in 1812.
It out-competes grasses and other forage species, reducing food sources for wildlife and livestock.
Bighead knapweed has conspicuously large, yellow flowers that are 3-8 cm wide.
The leaves are elliptic and alternately arranged. The leaves grow pointing upwards and blades of the leaves extend down along the stem creating characteristic vertical “wings” on the stem.
This knapweed grows up to 150 cm tall.