Nigel Cattlin / Common couch grass (Elymus repens) shoots and rhizomatous roots, on black background.

Nigel Cattlin / Common couch grass (Elymus repens) stems, shoots and rhizomatous roots, black background.

Nigel Cattlin / Common couch grass (Elymus repens) shoots and rhizomatous roots, white background.

Nigel Cattlin / Common couch grass (Elymus repens) stems, shoots and rhizomatous roots, white background.

Nigel Cattlin / Common couch grass (Elymus repens) with rhizomatous roots, white background.

Nigel Cattlin / Couch / Twitch grass (Elymus repens) with complex underground root system of rhizomes, a common weed.

Nigel Cattlin / Couch grass (Agropyron repens) roots and spreading young underground rhizomes

Nigel Cattlin / Couch grass rhizomes (Elymus repens), dug up from an established vegetable garden and capable of invasive regrowth Berkshire, England, UK.

Nigel Cattlin / Spraying glyphosate pre-harvest herbicide on to control couch (IAgropyron repens) in a ripe wheat crop

Nigel Cattlin / Severe infestation of couch, twitch or quackgrass (Agropyron repens) perennial grass weeds in a strawberry crop

Nigel Cattlin / Couch (Agropyron repens) perennial rhizomatous grass weed infestation in a cabbage crop