Sorghum ÃÂ almum, the Columbus grass, is a hybrid species of flowering plant in the family Poaceae. Its parents are Sorghum bicolor ÃÂ S. halepense (Johnsongrass). Sorghum ÃÂ almum is one of the most valuable livestock forage and fodder crops during summer in semi-arid and sub-humid areas worldwide. It is considered a noxious weed in several US and Australian states.