Wildflower (forb) · Orchidaceae
Hooded lady's tresses
Spiranthes romanzoffiana
Hooded lady's tresses is recorded as native to 28 states and territories in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in 364 counties of those states by USDA PLANTS.
Key facts · USDA PLANTS
Hooded lady's tresses at a glance
- Native in
- 364 counties, across 28 states and territories
- Estimated cold hardiness
- Zone 3b PLANTS minimum temperature −38°F
- Mature height
- 2.5 ft PLANTS mature height
- Light and water
- Sun to part shade High water use
Estimated cold hardiness: zone 3b. PLANTS gives a minimum temperature of −38°F; zone 3b winters bottom out at −35°F, the coldest half-zone that stays within that limit.
Hooded lady's tresses is recorded as native to 28 states and territories in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in 364 counties of those states by USDA PLANTS.
Counties where it is native
The 15 counties with the most ZIP codes among the 364 where it is listed.
Native counties by state
- Alaska 22 counties
- Arizona 3 counties
- California 37 counties
- Colorado 20 counties
- Connecticut statewide record
- Idaho 20 counties
- Illinois 4 counties
- Indiana 4 counties
- Iowa 1 county
- Maine 15 counties
- Massachusetts 3 counties
- Michigan 40 counties
- Minnesota 21 counties
- Nebraska 4 counties
- Nevada 4 counties
- New Hampshire 7 counties
- New Mexico 5 counties
- New York 20 counties
- North Dakota 2 counties
- Ohio 6 counties
- Oregon 28 counties
- Pennsylvania 2 counties
- South Dakota 5 counties
- Utah 11 counties
- Vermont 12 counties
- Washington 25 counties
- Wisconsin 30 counties
- Wyoming 13 counties
Growing traits
Values from the PLANTS characteristics record. “Not recorded” means PLANTS has no value; nothing here is estimated except the zone.
Growth
- Growth habit
- Forb/herb
- Duration
- Perennial
- Mature height
- 2.5 ft
- Growth rate
- Moderate
- Growth form
- Single Crown
- Shape
- Erect
- Lifespan
- Short
- Active growth period
- Summer
Light and water
- Shade tolerance
- Intermediate (sun to part shade)
- Moisture use
- High water use
- Drought tolerance
- None
- Tolerance of waterlogged soil
- High
- Precipitation range
- 12 to 55 in per year
Soil
- Soil textures
- Medium and fine
- pH range
- 4.5 to 8.5
- Lime (CaCO₃) tolerance
- Low
- Salinity tolerance
- None
- Fertility requirement
- Medium
- Minimum root depth
- 8 in
Climate
- Minimum temperature
- −38°F
- Estimated cold hardiness
- Zone 3b and warmer
- Minimum frost-free days
- 85
- Fire tolerance
- Low
Flowers, leaves and fruit
- Flower color
- White
- Showy flowers
- Yes
- Bloom period
- Mid Summer
- Foliage color
- Green
- Showy in fall
- No
- Keeps leaves
- No
- Fruit color
- Brown
Other
- Toxicity
- None
- Nitrogen fixation
- None
- Nursery availability
- No Known Source
- Family
- Orchidaceae
- PLANTS symbol
- SPRO
Source & data date
- Source
- USDA NRCS PLANTS Database: county distribution records, native status and plant characteristics. CC0 (public domain dedication, per the data.gov catalog record).
- Kew’s World Checklist of Vascular Plants (WCVP): native or introduced status by state. CC BY 3.0.
- USGS US-RIIS (ver. 2.0): species listed as introduced are excluded. CC0.
- Citation
- USDA, NRCS. 2026. The PLANTS Database (https://plants.usda.gov, 11/04/2026). National Plant Data Team, Greensboro, NC USA.
- Govaerts R. (ed.) (2026). WCVP: World Checklist of Vascular Plants. Facilitated by the Royal Botanic Gardens, Kew. Data file dated 2026-06-04, http://sftp.kew.org/pub/data-repositories/WCVP/ (retrieved 2026-11-04). Paper: Govaerts R. et al. (2021) The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. Scientific Data 8, 215.
- Data date
- Retrieved from PLANTS on November 4, 2026; WCVP data file dated June 4, 2026.
- Scope
- Spiranthes romanzoffiana (PLANTS symbol SPRO).
- Method
- A species is listed when it is recorded as native to the state in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in the county by USDA PLANTS. Species PLANTS labels both native and introduced are listed separately. Full method · All sources