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Greater Duckweed

Spirodela polyrhiza

Also listed as Spirodela polyrrhiza

In the Carolinas and Georgia, found in still to slowly moving waters of ponds, lakes, beaver ponds, and swamps. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you

22
Good

Native to Louisiana (estimated). How scores work Is it native here?

Profile 82%

Light
Full sun
Soil moisture
Usually moist
Will it fit your yard?

At a glance

Life cycle
Perennial
Bloom
Late summer
Fruiting season
Summer to fall

Not yet recorded · Height · Spread · Leaves

Recorded in 13 Louisiana parishes.

Natural habitats

Places it grows wild. Not a planting requirement. Each habitat page lists the plants and wildlife also found there.

1 of 2

Ponds, lakes and their shores

Still water and its edges: ponds, lakes, millponds and reservoirs.

Swamps

Forested wetlands with standing water much of the year, such as cypress and gum swamps.

All habitats

Also found with this plant

Wildlife whose habitat models include habitats this plant grows in, in Louisiana. Shared habitat, not food. 134 animals.

All wildlife of Louisiana

Ecological relationships

Who uses this plant?

What these records mean

2CaterpillarsGenus host records with ranges including LA

Genus host records with ranges including LA · Spirodela

  • Elophila obliteralisWaterlily Leafcutter Moth
  • Elophila tinealisBlack Duckweed Moth
Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
0BeesSoutheastern regional records
0Specialist beesPollen specialists
1BirdsRecorded genus food-resource interactions; not a state feeding claim

Recorded genus food-resource interactions; not a state feeding claim · Spirodela

  • Aix sponsaWood Duck
Hurlbert, Olsen, Sawyer & Winner 2021, Avian Diet Database, Scientific Data 8: 260 (CC0)

Direct food only: birds recorded eating this genus across North America. Caterpillars on host plants also feed nesting birds. NC Native Plant Society: butterfly gardening

No records yet · Ants · Beetles · Flies · Adult butterflies / moths · Other wasps · Other insects

Growing and identification

Plant details

Family
Araceae
Hardiness
Zones 5a–11b
Soil pH
Neutral
Flower color
Green
Growth rate
Moderate
Growth habit
Single crown
Foliage color
Green
Fruit begins
Summer
Fruit ends
Fall

Safety has not been reviewed for this plant; check toxicity and thorns before planting.

Growing sources and scope
  • Bloom · “Late summer” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Flower color · “Green” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Foliage color · “Green” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Fruit begins · “Summer” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Fruit ends · “Fall” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Growth habit · “Single crown” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Growth rate · “Moderate” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Hardiness · “Zones 5a–11b” · NC Extension Plant Toolbox
  • Life cycle · “Perennial” · NC Extension Plant Toolbox
  • Light · “Full sun (6 or more hours of direct sunlight a day)” · NC Extension Plant Toolbox
  • primary_flower_color · “green” · USDA PLANTS
  • Soil · “Occasionally wet” · NC Extension Plant Toolbox
  • Soil pH · “Neutral” · NC Extension Plant Toolbox
Also known as

Duckmeat; Spirodela polyrrhiza

Conservation status

Louisiana rankSNR
Global rankG5
LA statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

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Sources