Quick Facts

Scientific nameHygrophila polysperma
OriginIndia, Malaysia
IntroductionMid-1940s, aquarium trade
Aquatic communitySubmersed, emergent
HabitatWet soils to water 15 feet deep
DistributionCentral / South Florida, many canals
Management effortComplaint management
2014 public waters / plant acres:30 / 113

Environmental and Economic Concerns

  • Forms dense surface mats, especially in quiescent waters
    • excludes light and oxygen penetration for native plants and animals
    • hinders navigation and diminishes flood control capacity
    • especially abundant and problematic in south Florida canals
  • Fragile stems root at each leaf node, allowing rapid dispersal and establishment
  • Expensive and extremely difficult to control
  • Most infestations found in rivers or in lakes near river inflow
Hygrophila polysperma
Hygrophila polysperma
Hygrophila polysperma
Hygrophila polysperma

Management Options

BiologicalExtremely high rates of sterile grass carp (in canal systems)
ChemicalFlumioxazin most effective, frequent applications of various formulations / rates of copper, diquat, endothall, fluridone and 2,4-D provide marginal control
MechanicalHarvest floating mats - small fragments may start new infestation
PhysicalHand pulling, raking

Florida Fish & Wildlife Conservation Commission, Status of the Aquatic Plant Maintenance Program in Florida Public Waters, Annual Report – Fiscal Year 2009-2010.

Last updated: 30 December 2014