Johnson Grass

Sorghum halepense

Johnson Grass image

Johnson grass is native to the Mediterranean and introduced in the 1830s. This very aggressive weedy species can be found throughout much of Missouri. This is one of the largest and most common weedy grasses in the state. It can reach 8 feet tall. The plant flowers from June to Novemeber with reddish tinged seeds. It produces a natural toxin from its root system that prevents other plants from growing close to it, so it effectively serves as a "herbicide" to the competition. Stems and leaves are used by children to make grass whistles.