1. A coarse, weedy plant with a thick stem, found in pastures and waste areas; any of various plants considered undesirable or troublesome.
Usage: chiefly North American; often used in plural form

Examples

• The farmer spent the morning pulling bullweed from the pasture.
• Bullweed can quickly overtake a neglected garden if left unchecked.
• Cattle often avoid eating bullweed because of its tough, unpalatable stems.
• The field was choked with bullweed after a season of poor maintenance.