Johnsongrass (Sorghum halepense)


Category C Weed

Grass family (Poaceae)

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Stem

  • Up to 8 ft. tall; many tillers arise from crown; stems slightly flattened with prominent nodes

    Leaves

    • Up to 2 ft. long, 0.25-0.75 in. wide, white midvein and mostly hairless except near collar; ligule is membranous and tipped with fine hairs; NO auricles

      Flower

      • Seed head open and pyramid-shaped; purplish-brown at maturity

      • Seed is narrow, less than 0.25 in. long and reddish-brown to black

        Root

        • Deep, fibrous root system; rhizomes are white and fleshy with brown to purple nodes; roots and new plants often form at nodes

          Other

          • Grows best in moist soils; often found in crop fields, pastures, fencerows, roadsides, and along waterways; known to occur in Churchill, Clark, Douglas, Esmeralda, Lincoln, Mineral and Nye counties

          • Perennial; reproduces by seed and rhizomes; seedlings resemble corn and can best be identified by pulling a plant and examining the roots for an attached seed

          • Plants can be toxic to livestock after frost or drought

            Control

            • Frequent mowing or tillage is effective; burning is NOT

            • Apply sethoxydim, fluazifop or fenoxaprop to actively growing plants before boot stage, imazapic or flyphosate between boot and bloom stages¬†

              Images

              Johnsongrass plant
              Plant
              Johnsongrass Leaf stem
              Leaf stem
              Johnsongrass Root
              Root
              Johnsongrass Seed
              Seed
              Johnsongrass seedling
              Seedling
              Nevada Noxious Weed Field Guide
              Nevada Noxious Weed Guide