
Johnsongrass has been used for forage and to stop erosion, but it is often considered a weed for the following reasons: This species occurs in crop fields, pastures, abandoned fields, rights-of-way, forest edges, and along streambanks. It thrives in open, disturbed, rich, bottom ground, particularly in cultivated fields. Johnsongrass resistant to ...
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http://en.wikipedia.org/wiki/Johnson_grass

• 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.
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http://thinkexist.com/dictionary/meaning/johnson_grass/

<botany> 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. ... Synonym: Cuba grass, Means grass, Evergreen millet, and Arabian millet. ... Origin: Named after W. Johnson of Alabama, who planted it about 1840-1845. ......
Found on
http://www.encyclo.co.uk/local/20973
John'son grass` [ Named after W.
Johnson of Alabama, who planted it about 1840-1845.]
(Botany) 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 ,
...Found on
http://www.encyclo.co.uk/webster/J/11

[
n] - tall perennial grass that spreads by creeping rhizomes and is grown for fodder
Found on
http://www.webdictionary.co.uk/definition.php?query=Johnson%20grass

a sorghum, Sorghum halepense, that spreads by creeping rhizomes, grown for fodder. Also called
Found on
https://www.infoplease.com/dictionary/johnson-grass
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