What is "evergreen millet"

Johnson grass \John"son grass`\ [Named after W. Johnson of Alabama, who planted it about 1840-1845.] (Bot.) 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.

n. 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 [syn: Johnson grass, Aleppa grass, means grass, Sorghum halepense, Sorghum halapense]