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Scientific name Hygrophila polysperma
Origin India, Malaysia
Introduction Mid-1940s, aquarium trade
Aquatic community Submersed, emergent
Habitat Wet soils to water 15 feet deep
Distribution Central / South Florida, many canals
Management effort Complaint management
2014 public waters / plant acres 30 / 113
Hygrophila polyspermaHygrophila polysperma

Management Options

Biological Extremely high rates of sterile grass carp (in canal systems)
Chemical Flumioxazin most effective, frequent applications of various formulations / rates of copper, diquat, endothall, fluridone and 2,4-D provide marginal control
Mechanical Harvest floating mats – small fragments may start new infestation
Physical Hand pulling, raking

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

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