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Bighead Rush

Juncus megacephalus

In the Carolinas and Georgia, found in brackish and freshwater marshes, bogs, wet prairies, interdune swales, ditches, wet, open places. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you

46
Good

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

Profile 100%

Height
About 3.1 feet
Light
Partial shade, Full sun
Soil moisture
Moist to wet
Will it fit your yard?

At a glance

Bloom
June to August
Fruiting season
Summer

Not yet recorded · Spread · Life cycle · 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 4

Freshwater marshes

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

Prairies and grasslands

Open, grass-dominated places kept open by fire, grazing or thin soil, from tallgrass prairie to Piedmont prairies.

Coastal dunes and beaches

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

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

6CaterpillarsGenus host records with ranges including LA

Genus host records with ranges including LA · Juncus

  • Acronicta insularisHenry's Marsh Moth, Cattail Caterpillar
  • Bactra furfuranaRush Bactra
  • Bactra verutanaJavelin Moth
  • Cisseps fulvicollisYellow-Collared Scape Moth
  • Coleophora cratipennellaStreaked Coleophora
  • Thopeutis forbesellus
Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
2BeesSoutheastern regional records

Southeastern regional records · Juncus

Individual names are not available yet.

Noori, Seltmann & Orr 2026, A curated and integrated dataset for exploring global bee-plant interactions (GloBI), Zenodo, CC BY 4.0
0Specialist beesPollen specialists
5BirdsRecorded genus food-resource interactions; not a state feeding claim

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

  • Alectoris chukarChukar
  • Anas acutaNorthern Pintail
  • Coturnicops noveboracensisYellow Rail
  • Lagopus leucuraWhite-tailed Ptarmigan
  • Plectrophenax nivalisSnow Bunting
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
Juncaceae
Flower color
Green
Growth rate
Moderate
Growth habit
Spreads by rhizomes
Foliage color
Green
Fruit begins
Summer
Fruit ends
Summer

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

Growing sources and scope

Conservation status

Louisiana rankSNR
Global rankG4G5
LA statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

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How to check your spot

Growing cautions

  • Spreads by rhizomes. USDA PLANTS lists its growth form as rhizomatous. USDA PLANTS

For planning only; these do not change the score or Fit.

Sources