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Johnson
Grass - Sorghum halepense
Family: Poaceae
TPIUC
Description
The plants are coarse perennials. The stems are 50-150 cm tall, from extensively creeping scaly rhizomes; nodes are pubescent, internodes glabrous. Leaf blades are mostly less than 2 cm wide and up to 60 cm long, pubescent on the upper surface. The panicles are up to 60 cm long and 20 cm broad. The fruits have a deciduous point, 1-1.5 cm long, which is twisted below.
Interesting facts
Plants form coarse rhizomes finally occurring in dense stands. They grow in fields, along roadsides and in waste places essentially throughout the U.S. The leaves are often splotched with purple, due to a bacterial disease.
Both true sorghums (Sorghum vulgare Pers.), which are annuals, and Johnson grass sometimes produce hydrocyanic acid in sufficient abundance, especially in second growth, to cause poisoning in grazing animals. Plants have become troublesome weeds through most of the U.S.
VIDEO
Links to more information
Website, video, and graphics by Rob Nelson
For more information on this plant or management please contact US Army Corp of Engineers
