Giant Bristlegrass

Setaria magna

In the Carolinas and Georgia, found in Coastal tidal marshes (salinity not stated); Coastal dunes and beaches; freshwater marshes. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you

Good

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

Profile 76%

Height: Up to about 12 feet
Light: Full sun
Soil moisture: Wet to standing water

Will it fit your yard?

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At a glance

Life cycle: Annual

Not yet recorded · Spread · Leaves · Bloom

Bloom: NC species account not read yet.

Spread and leaves: no source found yet.

This plant is missing most of its facts, so Quercus is looking them up in old botany books.

Recorded in 18 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 3

Coastal tidal marshes (salinity not stated)

Tidal marshes of the Atlantic and Gulf coasts where the source does not say whether the water is fresh, brackish or salt. A stated salinity files the marsh under freshwater tidal marshes or salt and brackish marshes instead.

Coastal dunes and beaches

Open sand of beaches, dunes and the hollows between them.

Freshwater marshes

Open, herb-covered wetlands with fresh, non-tidal water.

All habitats

Also found with this plant

Wildlife whose habitat models include habitats this plant grows in, in Louisiana. Shared habitat, not food. 94 animals.

Sandhill Crane
Grus canadensis
Birds. 1 shared habitat
Sandwich Tern
Thalasseus sandvicensis
Birds. 1 shared habitat
Savannah Sparrow
Passerculus sandwichensis
Birds. 1 shared habitat
Seaside Sparrow
Ammodramus maritimus
Birds. 1 shared habitat
Semipalmated Plover
Charadrius semipalmatus
Birds. 1 shared habitat
Short-eared Owl
Asio flammeus
Birds. 1 shared habitat
Snow Goose
Chen caerulescens
Birds. 1 shared habitat
Snowy Egret
Egretta thula
Birds. 1 shared habitat
Song Sparrow
Melospiza melodia
Birds. 1 shared habitat
Sora
Porzana carolina
Birds. 1 shared habitat
Spotted Sandpiper
Actitis macularius
Birds. 1 shared habitat
Swallow-tailed Kite
Elanoides forficatus
Birds. 1 shared habitat
Swamp Sparrow
Melospiza georgiana
Birds. 1 shared habitat
Tricolored Heron
Egretta tricolor
Birds. 1 shared habitat
Virginia Rail
Rallus limicola
Birds. 1 shared habitat
Western Sandpiper
Calidris mauri
Birds. 1 shared habitat
White-faced Ibis
Plegadis chihi
Birds. 1 shared habitat
Wilson's Plover
Charadrius wilsonia
Birds. 1 shared habitat
Wood Stork
Mycteria americana
Birds. 1 shared habitat
Yellow Rail
Coturnicops noveboracensis
Birds. 1 shared habitat
Yellow-crowned Night-heron
Nyctanassa violacea
Birds. 1 shared habitat
Yellow-rumped Warbler
Dendroica coronata
Birds. 1 shared habitat

Widespread birds also seen here (13)

Found in many habitats here, so not listed above.

All wildlife of Louisiana

Ecological relationships

Who uses this plant?

What these records mean

10CaterpillarsGenus host records with ranges including LA

Genus host records with ranges including LA · Setaria

Ancyloxypha numitorLeast Skipper
Dargida diffusaWheat Head Armywotm Moth
Helicoverpa zeaCorn Earworm Moth
Hypena scabraGreen Cloverworm Bomolocha, Black Snout
Lerema acciusClouded Skipper, Corn Leaf tier
Lerodea eufalaEufala Skipper, Gray Skipper, Rice Leafroller
Mythimna unipunctaArmyworm Moth, White Speck
Papaipema nebrisStalk Borer
Spodoptera frugiperdaFall Armyworm Moth
Blastobasis graminea

Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)

0BeesSoutheastern regional records

0Specialist beesPollen specialists

25BirdsRecorded eating Setaria in Louisiana

Diet records by plant genus, from studies across North America. Not a record from this state. Birds whose range includes Louisiana, most records first.