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Bushy Knotweed

Polygonum ramosissimum subsp. prolificum

Also listed as Polygonum prolificum, Polygonum ramosissimum ssp. prolificum

In the Carolinas and Georgia, found in brackish marshes, disturbed areas. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you

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Not scored

Native status unresolved in Louisiana. How scores work Is it native here?

Profile 71%

Height
Up to about 32 inches
Light
Partial shade, Full sun
Soil moisture
Dry to wet
Will it fit your yard?

At a glance

Life cycle
Annual
Bloom
July to November

Not yet recorded · Spread · Leaves

Recorded in 2 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

Salt and brackish marshes

Coastal marshes flooded by salty or brackish tides.

Roadsides, fields and disturbed ground

Ground opened by people: roadsides, old fields, pastures, fencerows and lots.

All habitats

Ecological relationships

Who uses this plant?

What these records mean

40CaterpillarsGenus host records with ranges including LA

Genus host records with ranges including LA · Polygonum

  • Achyra rantalisGarden Webworm Moth
  • Acronicta insularisHenry's Marsh Moth, Cattail Caterpillar
  • Acronicta oblinitaSmeared Dagger
  • Anticlea multiferataMany-Lined Carpet
  • Apantesis argeArge Tiger Moth
  • Apantesis naisNais Tiger Moth
  • Archips semiferanusOak Leafroller Moth
  • Calothysanis amaturariaCross-Lined Wave
  • Chionodes discoocellellaEyeringed Chionodes
  • Coleophora cratipennellaStreaked Coleophora
Show all 40
  • Costaconvexa centrostrigariaBent-Lined Carpet
  • Elophila obliteralisWaterlily Leafcutter Moth
  • Emmelina monodactylaMorning-Glory Plume Moth
  • Epiblema otiosanaBidens Borer Moth
  • Eusarca confusariaConfused Eusarca
  • Feltia subterraneaSubterranean Dart, Granulate Cutworm
  • Haematopis gratariaChickweed Geometer
  • Helicoverpa zeaCorn Earworm Moth
  • Homophoberia apicosaBlack Wedge-Spot, Smartweed Groundling
  • Hyles lineataWhite-Lined Sphinx
  • Hypena scabraGreen Cloverworm Bomolocha, Black Snout
  • Maliattha synochitisBlack-Dotted Lithacodia, Black-Dotted Glyph, Brass-Dotted Grass Moth
  • Melanolophia canadariaCanadian Melanolphia, Variable Redmarked Looper
  • Metarranthis duariaRuddy Metarranthis
  • Nephelodes miniansBronzed Cutworm
  • Nomophila nearcticaLucerne Moth, American Celery Webworm
  • Orthonama obstipataThe Gem
  • Ostrinia obumbratalisSmartweed Borer
  • Ostrinia penitalisAmerican Lotus Borer, Lily Moth
  • Parapoynx obscuralisObscure Pondweed Moth
  • Patania silicalisHerbivorous Patania, Herbivorous Pleuroptya
  • Prochoerodes lineolaLarge Maple Spanworm Moth
  • Pseudeustrotia carneolaPink-Barred Lithacodia, Pink-Barred Pseudeustrotia
  • Saucrobotys futilalisDogbane Saucrobotys
  • Schinia scissoidesDivided Flower Moth
  • Schinia spinosaeSpinose Flower Moth
  • Scopula limboundataLarge Lace-Border
  • Spilosoma congruaAgreeable Tiger Moth
  • Spilosoma virginicaVirginian Tiger Moth, Yellow Woolybear Moth, Yellow Bear
  • Strymon melinusGray Hairstreak
Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
—BeesSoutheastern regional records
—Specialist beesPollen specialists
58BirdsRecorded genus food-resource interactions; not a state feeding claim

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

  • Agelaius phoeniceusRed-winged Blackbird
  • Aix sponsaWood Duck
  • Alectoris chukarChukar
  • Anas acutaNorthern Pintail
  • Anas creccaGreen-winged Teal
  • Anas platyrhynchosMallard
  • Anser albifronsGreater White-fronted Goose
  • Anthus rubescensAmerican Pipit
  • Aythya affinisLesser Scaup
  • Aythya americanaRedhead
Show all 58
  • Aythya collarisRing-necked Duck
  • Aythya valisineriaCanvasback
  • Bonasa umbellusRuffed Grouse
  • Bucephala clangulaCommon Goldeneye
  • Callipepla californicaCalifornia Quail
  • Centrocercus urophasianusGreater Sage-Grouse
  • Colinus virginianusNorthern Bobwhite
  • Columba liviaRock Pigeon
  • Columbina passerinaCommon Ground Dove
  • Coturnicops noveboracensisYellow Rail
  • Dendragapus obscurusDusky Grouse
  • Dendrocygna autumnalisBlack-bellied Whistling-Duck
  • Dolichonyx oryzivorusBobolink
  • Eremophila alpestrisHorned Lark
  • Euphagus cyanocephalusBrewer's Blackbird
  • Francolinus francolinusBlack Francolin
  • Fulica americanaAmerican Coot
  • Gallinula galeataCommon Gallinule
  • Haemorhous mexicanusHouse Finch
  • Junco hyemalisDark-eyed Junco
  • Lagopus lagopusWillow Ptarmigan
  • Mareca americanaAmerican Wigeon
  • Meleagris gallopavoWild Turkey
  • Melospiza melodiaSong Sparrow
  • Melozone crissalisCalifornia Towhee
  • Molothrus aterBrown-headed Cowbird
  • Oreortyx pictusMountain Quail
  • Oxyura jamaicensisRuddy Duck
  • Passer domesticusHouse Sparrow
  • Perdix perdixGray Partridge
  • Pheucticus melanocephalusBlack-headed Grosbeak
  • Pinicola enucleatorPine Grosbeak
  • Pipilo maculatusSpotted Towhee
  • Porzana carolinaSora
  • Quiscalus quisculaCommon Grackle
  • Rallus elegansKing Rail
  • Rallus limicolaVirginia Rail
  • Sialia mexicanaWestern Bluebird
  • Sialia sialisEastern Bluebird
  • Spinus psaltriaLesser Goldfinch
  • Spizella passerinaChipping Sparrow
  • Sturnus vulgarisEuropean Starling
  • Turdus migratoriusAmerican Robin
  • Tympanuchus phasianellusSharp-tailed Grouse
  • Vireo griseusWhite-eyed Vireo
  • Zenaida macrouraMourning Dove
  • Zonotrichia atricapillaGolden-crowned Sparrow
  • Zonotrichia leucophrysWhite-crowned Sparrow
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

Growing and identification

Plant details

Family
Polygonaceae
Flower color
White or pink

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

Growing sources and scope
Also known as

Long Fruit Knotweed; Polygonum ramosissimum ssp. prolificum; Polygonum ramosissimum subsp. prolificum; Polygonum ramosissimum var. prolificum

Conservation status

Louisiana rankSNR
Global rankG5T4T5 [G4G5]
LA statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

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Sources