noun
- a weedy plant with purple, pink, or white flower heads, belonging to the genus Centaurea
Usage: botany
Examples
- The spotted knapweed has invaded many grasslands in North America.
- Farmers consider knapweed a troublesome weed that competes with crops.
- The purple flowers of knapweed bloom throughout the summer months.
- Wildlife managers work to control the spread of invasive knapweed species.
- Black knapweed is native to Europe but has spread to other continents.
- The knapweed’s tough stems make it difficult to remove by hand.