Bermudagrass Johnsongrass Medusahead Quackgrass Field Bindweed Hoary Cress Diffuse Knapweed Russian Knapweed Spotted Knapweed Squarrose Knapweed Purple Loosestrife Perennial Pepperweed Leafy Spurge Yellow Starthsitle Canada Thistle Musk Thistle Scotch Thistle Dyer's Woad Back to main weeds page   Johnsongrass Sorghum halepense   Adult Johnsongrass was introduced from the Mediterranean to the United States as a forage grass. However, when under frost or moisture stress it becomes toxic to livestock. It reproduces by seed and creeping lateral root systems. It thrives in rich soils and along waterways. Johnsongrass is a hardy perennial grass. It displays erect stems two to eight feet tall. Spreading roots send large fleshy rhizomes to the sides for wide distribution. Leaf blades are flat, up to one inch wide, with a prominent light midvein. Stems are stout with prominent nodes. Seedheads are reddish to purple.         Back to main weeds page   Buffalobur Common Burdock Camelthorn Goatsrue Jointed Goatgrass Poison Hemlock Black Henbane Houndstongue Blue-Flowering Lettuce Western Whorled Milkweed Silverleaf Nightshade Yellow Nutsedge Puncturevine Russian-Olive Saltcedar St. Johnswort Bull Thistle Dalmatian Toadflax Yellow Toadflax Velvetleaf