A tall rhizomatous perennial grass (Sorghum halepense) native to the Mediterranean region, sometimes cultivated for forage but widespread as a weed.
A forage and pasture grass (Sorghum halepense), widespread in the S U.S., often as a weed.
Origin of johnson-grass
- After William Johnson (died 1859), American agriculturalist
From American Heritage Dictionary of the English Language, 5th Edition