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Barren St. Johnswort

Hypericum sphaerocarpum

In the Carolinas and Georgia, found in limestone glades and barrens, prairies. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you

70
Strong

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

Profile 88%

Height
Up to about 2 feet
Spread
1.5–2.5 feet
Light
Full sun to part shade
Soil moisture
Dry to average

Space about 2 ft apart from its recorded spread, about 25 per 100 sq ft. Enter your bed size for a count

Will it fit your yard?

Rare or protected plant. Specialist conservation planting; excluded from routine garden suggestions. Plant caution source

Hidden from default planting suggestions. Wildlife value and native status remain unchanged.

At a glance

Life cycle
Perennial
Bloom
June to September

Not yet recorded · Leaves

Recorded in 4 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

Glades, barrens and outcrops on limestone

Open, thin-soil openings and rock on limestone, dolomite or other lime-rich rock, including cedar glades.

Prairies and grasslands

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

All habitats

Ecological relationships

Who uses this plant?

What these records mean

14CaterpillarsGenus host records with ranges including LA

Genus host records with ranges including LA · 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 14
  • Sparganothis sulfureanaSparganothis Fruitworm Moth, Sulfur Leafroller, False Yellow-Head
  • Tallula watsoniWatson's Tallula
  • Zale lunataLunate Zale
  • 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 · Hypericum

  • Aythya collarisRing-necked 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
Hardiness
Zones 5–8
Flower color
Yellow
Growing sources and scope
Also known as

Round Seed St. Johnswort

Conservation status

Louisiana rankS2
Global rankNot available
LA statusNot verified
Federal statusNot verified

Conservation source

In your garden

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Sources