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Center for Aquatic and Invasive Plants Logo    Plant Management in Florida Waters

Center for Aquatic and Invasive Plants Logo    Plant Management in Florida Waters

Quick Facts

  • Scientific name: Panicum repens
  • Origin: Old World
  • Introduction: Late 1800s, forage grass
  • Aquatic community: Emergent
  • Habitat: Dry land to water six feet deep
  • Distribution: Statewide
  • Management effort: Complaint management
  • 2017 public waters / plant acres: 357 (77%) / 5,089
  • 2017 Waters / acres controlled: 32 / 2,177

TorpedograssTorpedograss


Environmental and Economic Concerns

  • Spreads mostly by fragmentation and runners, but also by seed
  • Thick mats stop navigation and water movement
  • Displaces native plants in wet soils and shallow waters and marshes
  • Difficult to control due to extensive starch-laden rhizomes
  • Most widely dispersed invasive exotic plant in Florida public waters
  • Rapid growth and spread on exposed wet soils

Management Options

  • Biological: None available
  • Chemical: Glyphosate, imazapyr
  • Mechanical: Harvest floating mats. Tilling can cut rhizomes into many viable fragments
  • Physical: Drawdown and burn prior to treating with herbicides; flood after treatments.

Florida Fish & Wildlife Conservation Commission, Status of the Aquatic Plant Maintenance Program in Florida Public Waters, Annual Report – Fiscal Year 2016-2017.