johnsongrass

noun, often capitalized
john·​son·​grass | \ˈjän(t)-sən-ˌgras \

Definition of johnsongrass 

: a tall perennial sorghum (Sorghum halepense) originally of the Mediterranean region that is widely used for forage in warm areas and often becomes naturalized as a weed

First Known Use of johnsongrass

1884, in the meaning defined above

History and Etymology for johnsongrass

William Johnston †1859 American agriculturist

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The first known use of johnsongrass was in 1884

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