Photo Credit: Botanical Research Institute of Texas
Johnsongrass (Sorghum halepense) One of the most troublesome of perennial grasses. It reproduces from underground stems and seeds. Grows in spreading, leafy patches that may be as tall as 6 to 7 feet. Leaves have a prominent whitish midvein, which snap readily when folded over. The flower head is large, open, well branched, and often reddish tinged. Underground stems are thick, fleshy, and segmented. Roots and shoots can rise from each segment. Control by mowing regularly. It can’t stand the pressure. Johnsongrass has become resistant to the herbicide glyphosate (Roundup). Johnsongrass is the latest in a string of resistant weeds that calls into question the widespread use of genetically engineered (GE) herbicide-tolerant crops.
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