Meadow Knapweed


Perennial, with upright stems ranging from 20-40 inches tall and branching from the center. Single flowers are located at the tips of branches. Flowers are rose-purple in color and surrounded by brown bracts. Flower heads are round and about the size of a nickel.


Aggressive non-native that establishes rapidly in moist areas. This plant spreads easily, often displacing desirable natives, and grasses.

Cultural Control

Where feasible, cultivate infested pasture and rotate to an annual hay crop before reseeding to permanent forage. This plant does not tolerate repeated cultivation. Following establishment of the desired forage species, management or grazing practices is required to be successful.

Chemical Control

Selective herbicides are available. Check with local weed control supervisor or chemical consultant for specific recommendations.

Was this page helpful?

Related Content from OSU Extension

Have a question? Ask Extension!

Ask Extension is a way for you to get answers from the Oregon State University Extension Service. We have experts in family and health, community development, food and agriculture, coastal issues, forestry, programs for young people, and gardening.