• Giant Salvinia Plant 215x150

Category A Weed

Salvinia family (Salviniaceae)

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Giant salvinia (Salvinia molesta)


    • Floating aquatic plant that grows at water surface; often highly branched


      • 1 submerged and 2 floating leaves whorled around stem at each node

      • Floating leaves are oval, flat, 1-2.5 in. wide and covered with short hairs (less than 0.12 in. long) that are shaped like an egg-beater

      • Submerged leaves are white to brown, fine, hair-like, up to 1 in. long and resemble roots


        • No true flowers; some submerged leaves develop spores, but they are not viable


          • No true roots, but submerged leaves act as roots


            • Grows best in areas that do not experience extended periods of freezing temperatures; not known to occur in Nevada

            • Perennial; reproduces by stem fragments; can form a mat over 1.5 ft. thick under favorable conditions

            • Listed on the Federal Noxious Weed List


              • Mechanical removal can be effective but must be done repeatedly; escaped stem fragments can form new plants

              • Aquatic herbicides such as 2,4-D, diquat and fluridone are effective