Johnson grass (Sorghum halepense)

Johnson grass (Sorghum halepense) ranks among the world's ten worst weeds due to its aggressive growth and invasiveness. Capable of spreading quickly through both seeds and rhizomes, it outcompetes crops for essential resources like water, nutrients, and sunlight. Additionally, under stress from frost or heat, it can release hydrogen cyanide, which is toxic to livestock. Its rapid proliferation poses significant challenges for agricultural management and control. The weed is named after Colonel William Johnson, who introduced it widely in Alabama around 1840.