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Couch grass Agropyron repens Also know as twitch. An incredibly invasive broad-leaved grass, which will smother plants in borders very easily. How to kill Couchgrass: Chemical Options: Glyphosate weed killers are by far the best option for all grass weeds, treat the couch grass when it is in lush spring growth, and it should be dead in 3 weeks time. Organic Options: Digging it up will leave tiny fragments which will quickly regrow, so the only perment option is to use a weed suppressing fabric. Back to weed index