Johnson grass

American  

noun

1. a sorghum, Sorghum halepense, that spreads by creeping rhizomes, grown for fodder.

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Johnson grass British  

noun

1. a persistent perennial Mediterranean grass, Sorghum halepense, cultivated for hay and pasture in the US where it also grows as a weed See also sorghum

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Etymology

Origin of Johnson grass

1880–85, named after William Johnson, American agriculturist who first planted it in 1840