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Greater Marsh St. John's-wort

Triadenum walteri

Found in swamp forests and marshes. FloraQuest, phone app (app page) What its natural habitat tells you

69
Strong

Native to Virginia. 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 51 Virginia 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

View, Dismal Swamp, North Carolina
Named place / source context. Shown: Great Dismal Swamp, North Carolina, as titled by Museum of Fine Arts Boston; nineteenth-century artistic interpretation, a neighboring state.View, Dismal Swamp, North Carolina, Regis Francois Gignoux, 1850. Public domain. Source record.

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 Virginia. Shared habitat, not food. 151 animals.

All wildlife of Virginia

Ecological relationships

Who uses this plant?

What these records mean

22CaterpillarsGenus host records with ranges including VA

Genus host records with ranges including VA · Hypericum

  • Acleris maculidorsanaStained-Back Leafroller Moth
  • Choristoneura rosaceanaOblique-Banded Leafroller Moth, Rosaceous Leaf Roller
  • Eupithecia miserulataCommon Eupithacia, Common Pug
  • Hyppa xylinoidesCommon Hyppa
  • Iodopepla u-albumBurgundy St. Johnswort Moth, White-Eyed Borer
  • Iridopsis ephyrariaPale-Winged Gray
  • Melanchra assimilisBlack Arches
  • Nedra ramosulaGray Half-Spot
  • Nemoria bistriariaTwo-Striped Emerald, Red-Fringed Emerald
  • Nemoria tuscaroraAppalachian Emerald
Show all 22
  • Phlogophora irisOlive Angle Shades
  • Platynota flavedanaBlack-Shaded Platynota
  • Probole amicariaFriendly Probole
  • Sparganothis sulfureanaSparganothis Fruitworm Moth, Sulfur Leafroller, False Yellow-Head
  • Synchlora aerataWavy-Lined Emerald, Camouflaged Looper
  • Tallula watsoniWatson's Tallula
  • Xestia c-nigrumSpotted Cut-Worm, Setaceous Hebrew Character, Lesser Black-letter Dart
  • Zale lunataLunate Zale
  • Agonopterix hyperella
  • Agonopterix lythrella
  • Coleotechnites nigritus
  • 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
  • Bloom · “July to September” · FloraQuest: Carolinas, Georgia (Southeastern Flora Team), phone app (app page) · Carolinas and Georgia
  • Flower color · “White, pink or green” · Lady Bird Johnson Wildflower Center
  • Height · “Up to about 3 feet” · Lady Bird Johnson Wildflower Center
  • Life cycle · “Perennial” · Lady Bird Johnson Wildflower Center
  • Light · “Partial shade; Full shade; Full sun (documented habitat)” · FloraQuest: Carolinas, Georgia (Southeastern Flora Team), phone app (app page) · Carolinas and Georgia
  • Soil · “Moist; Wet (documented habitat)” · FloraQuest: Carolinas, Georgia (Southeastern Flora Team), phone app (app page) · Carolinas and Georgia
Also known as

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

Conservation status

Virginia rankS5
Global rankG5
VA statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

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Sources