West Indian marsh grass

Quick Facts

Scientific nameHymenachne amplexicaulis
OriginCentral, South America, West Indies
Introduction1970s, natural colonization (?)
Aquatic communityEmergent
HabitatWet soils to shallow water
DistributionSouth & Southwest Florida
Management effortMaintenance 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
Hymenachne amplexicaulis
Hymenachne amplexicaulis

Management Options

BiologicalNone available
ChemicalGlyphosate, imazapyr
MechanicalImpractical; plants grow in shallow marshes
PhysicalFire + 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.

Last updated: 30 December 2014