noun
- plural of knapweed; weedy plants of the genus Centaurea with purple, pink, or white flower heads, often considered invasive
Usage: botany
Examples
- The spotted knapweeds have spread rapidly across the prairie.
- Farmers struggle to control knapweeds in their pastures.
- These purple knapweeds are crowding out native wildflowers.
- The county launched a program to remove invasive knapweeds.
- Knapweeds can reduce forage quality for livestock.
- Several species of knapweeds were accidentally introduced from Europe.