Common St. John's-wort
Hypericum perforatum
Not native to Louisiana. How scores work Is it native here?
Profile 71%
- Height
- 1–3 feet
- Spread
- 9 inches–2 feet
- Light
- Full sun, Partial shade
- Soil moisture
- Usually moist
Do not plant. Listed invasive in Louisiana.
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At a glance
- Life cycle
- Perennial
- Leaves
- Deciduous
Not yet recorded · Bloom
Recorded in 3 Louisiana parishes.
Who uses this plant?
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
—BeesSoutheastern regional records
—Specialist 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
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
Plant details
- Family
- Hypericaceae
- Hardiness
- Zones 3a–8b
- Soil pH
- Acidic to alkaline
- Flower color
- Yellow
What its natural habitat tells you
Safety has not been reviewed for this plant; check toxicity and thorns before planting.
Growing sources and scope
- Flower color · “Yellow” · NC Extension Plant Toolbox
- Hardiness · “Zones 3a–8b” · NC Extension Plant Toolbox
- Height · “1–3 feet” · NC Extension Plant Toolbox (ranked first; Fire Effects Information System: Hypericum perforatum differs)
- Leaves · “Deciduous” · NC Extension Plant Toolbox
- Life cycle · “Perennial” · NC Extension Plant Toolbox
- Light · “Full sun (6 or more hours of direct sunlight a day); Partial shade (direct sunlight only part of the day, 2-6 hours)” · NC Extension Plant Toolbox
- primary_flower_color · “yellow” · NC Extension Plant Toolbox
- Soil · “Moist” · NC Extension Plant Toolbox
- Soil pH · “Acidic to alkaline” · NC Extension Plant Toolbox
- Spread · “9 inches–2 feet” · NC Extension Plant Toolbox
Also known as
Common St. John's wort; Common St. Johnswort; European St. Johnswort
Conservation status
| Louisiana rank | SNA |
|---|---|
| Global rank | GNR |
| LA status | Not verified |
| Federal status | Not verified |
Sources
- NatureServe Explorer
- USDA PLANTS
- Louisiana occurrence source
- Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
- Noori, Seltmann & Orr 2026, A curated and integrated dataset for exploring global bee-plant interactions (GloBI), Zenodo, CC BY 4.0
- Smith, Bachelder, Russell, Morales, Mosher & Seltmann 2024, Bee-Specialization-Modeling v0.6.1 (specialist host table compiled from J. Fowler's pollen specialist bee lists), Zenodo, CC BY 4.0
- Hurlbert, Olsen, Sawyer & Winner 2021, Avian Diet Database, Scientific Data 8: 260 (CC0)
- Narango, Tallamy & Shropshire 2020, Few keystone plant genera support the majority of Lepidoptera species, Nature Communications