Wildflower (forb) · Asteraceae
Lambstongue ragwort
Senecio integerrimus
Lambstongue ragwort is recorded as native to 16 states and territories in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in 346 counties of those states by USDA PLANTS.
Key facts · USDA PLANTS
Lambstongue ragwort at a glance
- Native in
- 346 counties, across 16 states and territories
- Estimated cold hardiness
- Zone 3b PLANTS minimum temperature −38°F
- Mature height
- 1.1 ft PLANTS mature height
- Light and water
- Sun to part shade Medium 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.
Lambstongue ragwort is recorded as native to 16 states and territories in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in 346 counties of those states by USDA PLANTS.
Counties where it is native
The 15 counties with the most ZIP codes among the 346 where it is listed.
Native counties by state
- California 29 counties
- Colorado 25 counties
- Idaho 35 counties
- Iowa 5 counties
- Kansas 2 counties
- Minnesota 19 counties
- Montana 36 counties
- Nebraska 13 counties
- Nevada 14 counties
- New Mexico 2 counties
- North Dakota 39 counties
- Oregon 28 counties
- South Dakota 24 counties
- Utah 29 counties
- Washington 24 counties
- Wyoming 22 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
- Biennial, Perennial
- Mature height
- 1.1 ft
- Growth rate
- Moderate
- Growth form
- Single Crown
- Shape
- Erect
- Lifespan
- Moderate
- Active growth period
- Spring and Summer
Light and water
- Shade tolerance
- Intermediate (sun to part shade)
- Moisture use
- Medium water use
- Drought tolerance
- Low
- Tolerance of waterlogged soil
- Low
- Precipitation range
- 10 to 24 in per year
Soil
- Soil textures
- Coarse, medium and fine
- pH range
- 6.5 to 8.5
- Lime (CaCO₃) tolerance
- Medium
- Salinity tolerance
- Low
- Fertility requirement
- Medium
- Minimum root depth
- 14 in
Climate
- Minimum temperature
- −38°F
- Estimated cold hardiness
- Zone 3b and warmer
- Minimum frost-free days
- 120
- Fire tolerance
- High
Flowers, leaves and fruit
- Flower color
- Yellow
- Showy flowers
- Yes
- Bloom period
- Mid Spring
- Foliage color
- Dark Green
- Showy in fall
- No
- Keeps leaves
- No
- Fruit color
- Brown
Other
- Toxicity
- Moderate
- Nitrogen fixation
- None
- Nursery availability
- No Known Source
- Family
- Asteraceae
- PLANTS symbol
- SEIN2
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
- Senecio integerrimus (PLANTS symbol SEIN2).
- 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