Quercus

Alligator-weed

Alternanthera philoxeroides

Not native to South Carolina

Plant this instead

Choose your county to list local plants first.

  • Carolina Fanwort
    Cabomba caroliniana

    Similar growth form, height, evergreen or deciduous

  • Marsh Seedbox
    Ludwigia palustris

    Similar growth form, height, evergreen or deciduous

    Different: flower color

  • Canadian Waterweed
    Elodea canadensis

    Similar growth form, height, evergreen or deciduous

    Different: bloom season

More natives for your garden

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Ecological relationships

Who uses this plant?

7CaterpillarsGenus host records with ranges including SC

Genus host records with ranges including SC · Alternanthera

  • Herpetogramma bipunctalisSouthern Beet Webworm, Two-Spotted Herpetogramma
  • Hymenia perspectalisSpotted Beet Webworm
  • Macrorrhinia endonepheleReddish Macrorrhinia/Alligatorweed Stem Borer Moth
  • Spodoptera frugiperdaFall Armyworm Moth
  • Spodoptera ornithogalliYellow-Striped Armyworm Moth, Cotton Cutworm
  • Spoladea recurvalisHawaiian Beet Webworm
  • Staphylus hayhurstiiHayhurst's Scallopwing, Scalloped Sooty Wing, Scalloped Sootywing
Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
—BeesSoutheastern regional records
—Specialist beesPollen specialists
—BirdsRecorded genus food-resource interactions; not a state feeding claim
Growing and identification

Plant details

Family
Amaranthaceae
Hardiness
Zones 7a–10b
Flower color
White
Growth rate
Rapid
Growth habit
Spreads by runners
Foliage color
Green
Fruit begins
Spring
Fruit ends
Summer

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

Growing sources and scope
  • Bloom · “Early spring” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Flower color · “White” · NC Extension Plant Toolbox
  • Foliage color · “Green” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Fruit begins · “Spring” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Fruit ends · “Summer” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Growth habit · “Spreads by runners” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Growth rate · “Rapid” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Hardiness · “Zones 7a–10b” · NC Extension Plant Toolbox
  • Height · “About 2.4 inches” · USDA PLANTS · Nationwide species characteristics; local growing conditions may vary
  • Life cycle · “Perennial” · NC Extension Plant Toolbox
  • Light · “Full sun (6 or more hours of direct sunlight a day); Partial shade (direct sunlight only part of the day, 2-6 hours)” · NC Extension Plant Toolbox
  • primary_flower_color · “white” · USDA PLANTS
  • Soil · “Frequent standing water; Moist; Occasionally wet” · NC Extension Plant Toolbox
Also known as

Alligator Weed; Alligator weed

Conservation status

South Carolina rankNot available
Global rankGNR
SC statusNot verified
Federal statusNot verified

Conservation source Global and federal source

Sources