West Indian marsh grass

Quick Facts

Scientific name Hymenachne amplexicaulis
Origin Central, South America, West Indies
Introduction 1970s, natural colonization (?)
Aquatic community Emergent
Habitat Wet soils to shallow water
Distribution South & Southwest Florida
Management effort Maintenance control
2014 public waters / plant acres: 38 / 1,010

Environmental and Economic Concerns

  • Forms dense monocultures in marshes and along shorelines
  • Displaces native grasses because of its broader tolerance to wet and dry periods
  • Difficult to control when growing among native grasses because they are susceptible to the same control methods
Hymenachne amplexicaulis 
Hymenachne amplexicaulis

Management Options

Biological None available
Chemical Glyphosate, imazapyr
Mechanical Impractical; plants grow in shallow marshes
Physical Fire + glyphosate to control regrowth

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