Couch grass, as a vernacular common name, may refer to:
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Cynodon dactylon
''Cynodon dactylon'', commonly known as Bermuda grass, is a grass found worldwide. It is native to Europe, Africa, Australia and much of Asia. It has been introduced to the Americas. Although it is not native to Bermuda, it is an abundant invasi ...
'', known as couch grass in Australia and South Africa, often planted as a turf grass
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Elymus repens
''Elymus repens'', commonly known as couch grass, is a very common perennial species of grass native to most of Europe, Asia, the Arctic biome, and northwest Africa. It has been brought into other mild northern climates for forage or erosion cont ...
'', known as couch grass in the United Kingdom and North America, often considered to be a weed
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Sporobolus virginicus
''Sporobolus virginicus'', known by numerous common names including seashore dropseed, marine couch, sand couch, salt couch grass, saltwater couch, coastal rat-tail grass, and nioaka, is a species of grass with a wide distribution.
Description
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'', a perennial grass native to the southeastern United States that is often used as a lawn grass in warmer climates.
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Paspalum vaginatum
''Paspalum vaginatum'' is a species of grass known by many names, including seashore paspalum, biscuit grass, saltwater couch, silt grass, and swamp couch.