Sorghum halepense is considered to be one of the ten worst weeds in the world.Fifty-three countries, ranging in latitude from 55 N to 45 S report Johnson grass as a major problem; the problem is most serious in the region from the Mediterranean to the Middle East and India, Australia, central South America and the Gulf Coast of the United States.The distinguishing characteristics of Sorghum halepense are the ribbed leaf sheath, the conspicuous midrib, the large, purplish panicle and the extensive rhizome system. Panicum bulbosum, which has been confused with Sorghum halepense, can be recognized by its short, knotty rhizomes and bulbous swellings at the base of the culms.
