Quack Grass

Elymus repens, commonly known as couch grass , is a very common perennial species of grass native to most of Europe, Asia, the Arctic, and northwest Africa. It has been brought into other mild northern climates for forage or erosion control, but it often becomes invasive in the area.

Elymus repens isn't just called common couch, it's also known as twitch, quick grass, quitch grass (also just quitch), dog grass, quackgrass, scutch grass, and witchgrass.