Definitions:

1. A kind of grass that spreads quickly, and is mostly considered a weed. NOUN
   • The farmer applied a selective herbicide to control the quackgrass that was reducing wheat yields in his fields.
2. A widespread perennial grass that is considered a weed in many regions due to its aggressive growth and tendency to compete with cultivated plants. NOUN
   • Gardeners often struggle with quackgrass, as its deep rhizomes make it hard to remove completely once it has established itself.

Synonyms:

• agropyron repens
• couch grass
• dog grass
• quick grass
• witch grass