Moreover, there isn't a selective herbicide that kills quackgrass without hurting any surrounding turf. That's why quackgrass — also known as couchgrass, quickgrass, quitch, scotch, twitch ...

Quackgrass spreads via underground rhizomes, which makes it both very aggressive and also a nightmare to remove by hand. Pre-emergent herbicides won't work on quackgrass because it is a perennial.