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Horned Pondweed

Zannichellia palustris

In the Carolinas and Georgia, found in fresh or brackish water of ponds, lakes, and estuaries. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you

12
Modest

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

Profile 94%

Height
8–20 inches
Light
Full sun
Soil moisture
Standing water
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At a glance

Life cycle
Perennial
Bloom
February to October

Not yet recorded · Spread · Leaves

Recorded in 7 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.

Sounds, bays and tidal flats

Salt and brackish open water of sounds, bays and estuaries, with the mud and sand flats and seagrass beds that tides cover and uncover; the vegetated marsh is salt and brackish marshes.

All habitats

Ecological relationships

Who uses this plant?

What these records mean

0CaterpillarsGenus host records with ranges including LA
0BeesSoutheastern regional records
0Specialist beesPollen specialists
7BirdsRecorded genus food-resource interactions; not a state feeding claim

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

  • Anas acutaNorthern Pintail
  • Anas creccaGreen-winged Teal
  • Anas platyrhynchosMallard
  • Aythya americanaRedhead
  • Mareca americanaAmerican Wigeon
  • Mareca streperaGadwall
  • Somateria fischeriSpectacled Eider
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
Potamogetonaceae
Flower color
Green or brown

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

Growing sources and scope
Also known as

Horned Pond Weed

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