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Greater Marsh St. John's-wort

Triadenum walteri

Found in swamp forests and marshes. Weakley, Flora of the Southeastern United States (2025), South Central edition What its natural habitat tells you

68
Strong

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

Profile 88%

Height
Up to about 3 feet
Light
Partial shade, Full shade, Full sun
Soil moisture
Moist to wet
Will it fit your yard?

At a glance

Life cycle
Perennial
Bloom
July to September

Not yet recorded · Spread · Leaves

Recorded in 31 Mississippi counties.

Natural habitats

Places it grows wild. Not a planting requirement. Each habitat page lists the plants and wildlife also found there.

1 of 2

Swamps

Forested wetlands with standing water much of the year, such as cypress and gum swamps.

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 Mississippi. Shared habitat, not food. 133 animals.

All wildlife of Mississippi

Ecological relationships

Who uses this plant?

What these records mean

17CaterpillarsGenus host records with ranges including MS

Genus host records with ranges including MS · Hypericum

  • Acleris maculidorsanaStained-Back Leafroller Moth
  • Choristoneura rosaceanaOblique-Banded Leafroller Moth, Rosaceous Leaf Roller
  • Eupithecia miserulataCommon Eupithacia, Common Pug
  • Iodopepla u-albumBurgundy St. Johnswort Moth, White-Eyed Borer
  • Iridopsis ephyrariaPale-Winged Gray
  • Mocis latipesSmall Mocis, Striped Grass Looper
  • Nedra ramosulaGray Half-Spot
  • Nemoria bistriariaTwo-Striped Emerald, Red-Fringed Emerald
  • Platynota flavedanaBlack-Shaded Platynota
  • Probole amicariaFriendly Probole
Show all 17
  • Sparganothis sulfureanaSparganothis Fruitworm Moth, Sulfur Leafroller, False Yellow-Head
  • Synchlora aerataWavy-Lined Emerald, Camouflaged Looper
  • Tallula watsoniWatson's Tallula
  • Zale lunataLunate Zale
  • Caloptilia hypericella
  • Fomoria hypericella
  • Xenotemna pallorana
Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
43BeesSoutheastern regional records

Southeastern regional records · Hypericum

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
1BirdsRecorded genus food-resource interactions; not a state feeding claim

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

  • Aix sponsaWood Duck
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
Hypericaceae
Flower color
White, pink or green

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

Growing sources and scope
Also known as

Greater Marsh St. John's wort; Greater Marsh St. Johnswort; Hypericum walteri; john's wort; john's-wort

Conservation status

Mississippi rankSNR
Global rankG5
MS statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

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Sources