Fraser's marsh St. John's wort
Triadenum fraseri
Last reviewed: August 2026
Light
part sun
Water
high
Size
12"–24" H × 8"–12" W
Bloom
Jul, Aug, Sep
Native to
CT, DE, IA, IL and 21 more states
Pollinators
bees
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 431 programs across 44 states, each with a link to the provider and the date we last checked it.
Find rebates in your areaAn upright perennial with paired, oval leaves and small pink flowers that open only briefly in sunshine, growing in saturated soils of bogs and wet meadows. It holds an upright, slender form in standing water.
Wildlife value
Flowers are worked by native bees during their brief daily opening, and dense bog stands provide cover for wetland insects.
Common questions
- How much sun does Fraser's marsh St. John's wort need?
- Fraser's marsh St. John's wort grows best in part sun conditions.
- When does Fraser's marsh St. John's wort bloom?
- Fraser's marsh St. John's wort blooms in July, August, and September.
- Where is Fraser's marsh St. John's wort native?
- Fraser's marsh St. John's wort (Triadenum fraseri) is native to CT, DE, IA, IL and 21 more states, per the World Checklist of Vascular Plants (Kew).
- What pollinators does Fraser's marsh St. John's wort attract?
- Fraser's marsh St. John's wort draws bees.
Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
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