Johnson grass, Aleppo grass, means grass, evergreen millet, Sorghum halepense(noun)

tall perennial grass that spreads by creeping rhizomes and is grown for fodder; naturalized in southern United States where it is a serious pest on cultivated land

Johnson grass(Noun)

A perennial Mediterranean grass (Sorghum halepense) cultivated for forage

Johnson grass(u)

a tall perennial grass (Sorghum Halepense), valuable in the Southern and Western States for pasture and hay. The rootstocks are large and juicy and are eagerly sought by swine. Called also Cuba grass, Means grass, Evergreen millet, and Arabian millet