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Native plants · Idaho

Native plants of Lewis County

71 plant species are recorded as native to Idaho in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in Lewis County by USDA PLANTS. 52 of them have growing records you can filter by light, moisture, height and estimated cold hardiness. 1 more species is listed as both native and introduced and kept in a separate section.

County summary · USDA PLANTS and Kew WCVP

Lewis County, Idaho

Native species
71 Typical Idaho county: 302 (median of 44 counties)
Garden-ready natives
52 Typical Idaho county: 211
Share by type (all 71 native species)
Percent of the 71 native species in each growth type
Tree 10% (7)
Shrub 15% (11)
Wildflower (forb) 63% (45)
Grass or grass-like 8% (6)
Fern 3% (2)

Wildflowers make up the largest share of the native list (63%), followed by shrubs (15%).

Recorded native ranges can include long-established populations that spread from gardens; check your state’s native plant society list for local guidance. How native status is decided.

ZIP codes mainly in this county fall in USDA hardiness zone 6b (2023 map).

The native plant list

Cold hardiness is estimated from each plant’s PLANTS minimum temperature. How we estimate it.

Garden-ready natives 52

Native species with PLANTS growing records (height, light, moisture, minimum temperature). “—” means PLANTS has no value.

Garden-ready native plants of Lewis County, Idaho
PlantType HeightLight Water useHardy to
American licorice Glycyrrhiza lepidota Wildflower (forb) 4 ft Sun–part shade High Zone 3b
awlfruit sedge Carex stipata Grass or grass-like 3.5 ft Shade-tolerant Medium Zone 3b
common duckweed Lemna minor Wildflower (forb) — Sun High Zone 3b
creeping barberry Mahonia repens Shrub 2 ft Shade-tolerant Medium Zone 5a
cutleaf daisy Erigeron compositus Wildflower (forb) 1 ft Sun Low Zone 4a
darkthroat shootingstar Dodecatheon pulchellum Wildflower (forb) 2 ft Sun–part shade Medium Zone 4a
desert sweet Chamaebatiaria millefolium Shrub 6 ft Sun Low Zone 5a
fernleaf biscuitroot Lomatium dissectum Wildflower (forb) 15 ft Sun–part shade Low Zone 8a
foothill arnica Arnica fulgens Wildflower (forb) 2 ft Shade-tolerant Medium Zone 4b
granite prickly phlox Linanthus pungens Wildflower (forb) 2 ft Shade-tolerant Low Zone 4a
heartleaf arnica Arnica cordifolia Wildflower (forb) 1.5 ft Shade-tolerant High Zone 4b
Hooker's evening primrose Oenothera elata Wildflower (forb) 5 ft Sun High Zone 5a
Indianhemp Apocynum cannabinum Wildflower (forb) 3.3 ft Sun–part shade High Zone 3a
lambstongue ragwort Senecio integerrimus Wildflower (forb) 1.1 ft Sun–part shade Medium Zone 3b
largeflower triteleia Triteleia grandiflora Wildflower (forb) 2 ft Sun–part shade Medium Zone 4a
Lewis flax Linum lewisii Wildflower (forb) 2.5 ft Sun Medium Zone 3b
Lewis' mock orange Philadelphus lewisii Shrub 12 ft Sun Low Zone 8a
Mexican muhly Muhlenbergia mexicana Grass or grass-like 3 ft Sun–part shade Medium Zone 4a
mule-ears Wyethia amplexicaulis Wildflower (forb) 2.5 ft Sun Medium Zone 3b
narrowleaf willow Salix exigua Tree 10 ft Sun–part shade High Zone 3b
Nebraska sedge Carex nebrascensis Grass or grass-like 3 ft Sun High Zone 3b
needle spikerush Eleocharis acicularis Grass or grass-like 8 in Sun Medium Zone 5a
nineleaf biscuitroot Lomatium triternatum Wildflower (forb) 2.2 ft Sun–part shade Medium Zone 4a
nodding microseris Microseris nutans Wildflower (forb) 2 ft Shade-tolerant Medium Zone 4b
Nootka rose Rosa nutkana Shrub 10 ft Shade-tolerant High Zone 8a
northern bedstraw Galium boreale Wildflower (forb) 3 ft Sun–part shade Medium Zone 4a
old man's whiskers Geum triflorum Wildflower (forb) 1.5 ft Sun–part shade Medium Zone 3b
onespike danthonia Danthonia unispicata Grass or grass-like 10 in Sun Low Zone 4b
Oregon checkerbloom Sidalcea oregana Wildflower (forb) 4.5 ft Shade-tolerant High Zone 3b
pearly pussytoes Antennaria anaphaloides Wildflower (forb) 2.5 ft Sun–part shade Medium Zone 4a
plains pricklypear Opuntia polyacantha Shrub 2 ft Sun Low Zone 4b
red alder Alnus rubra Tree 90 ft Sun High Zone 5a
roundleaf alumroot Heuchera cylindrica Wildflower (forb) 6 ft Sun–part shade Low Zone 6a
rubber rabbitbrush Ericameria nauseosa Shrub 4 ft Sun Medium Zone 3b
Scouler's willow Salix scouleriana Tree 50 ft Sun–part shade High Zone 6a
seep monkeyflower Mimulus guttatus Wildflower (forb) 2.5 ft Shade-tolerant High Zone 3b
Sitka willow Salix sitchensis Tree 23 ft Sun High Zone 5b
slender cinquefoil Potentilla gracilis Wildflower (forb) 2.4 ft Sun Low Zone 3a
sticky cinquefoil Potentilla glandulosa Wildflower (forb) 1.5 ft Sun–part shade Low Zone 4a
sticky currant Ribes viscosissimum Shrub 3.5 ft Sun — Zone 3b
sticky purple geranium Geranium viscosissimum Wildflower (forb) 3 ft Shade-tolerant Low Zone 6a
streambank wild hollyhock Iliamna rivularis Wildflower (forb) 6 ft Sun–part shade Medium Zone 4a
thimbleberry Rubus parviflorus Shrub 4 ft Sun–part shade High Zone 4b
Venus penstemon Penstemon venustus Shrub 2 ft Sun–part shade Medium Zone 5b
water knotweed Polygonum amphibium Wildflower (forb) 1 in Sun High Zone 5a
wavyleaf Indian paintbrush Castilleja applegatei Wildflower (forb) 1.5 ft Sun Low Zone 4b
wax currant Ribes cereum Shrub 3 ft Sun Low Zone 5a
western redcedar Thuja plicata Tree 150 ft Shade-tolerant Medium Zone 4a
western stoneseed Lithospermum ruderale Wildflower (forb) 1.5 ft Sun Low Zone 4b
western valerian Valeriana occidentalis Wildflower (forb) 3 ft Sun High Zone 4b
white alder Alnus rhombifolia Tree 65 ft Shade-tolerant High Zone 5a
yellow fritillary Fritillaria pudica Wildflower (forb) 1 ft Sun–part shade Medium Zone 12a

Other native species recorded here 19

PLANTS has no growing records for these, so light, moisture, height and zone filters cannot include them. Many are wild species seldom sold by nurseries.

  • Bebb willow Salix bebbiana
  • bigbract verbena Verbena bracteata
  • blite goosefoot Chenopodium capitatum
  • Canadian gooseberry Ribes oxyacanthoides
  • clustered broomrape Orobanche fasciculata
  • Douglas' knotweed Polygonum douglasii
  • giant red Indian paintbrush Castilleja miniata
  • hairy waterclover Marsilea vestita
  • Howell's pussytoes Antennaria howellii
  • meadow deathcamas Zigadenus venenosus
  • Menzies' campion Silene menziesii
  • muskflower Mimulus moschatus
  • narrowleaf bur-reed Sparganium angustifolium
  • narrowleaf minerslettuce Montia linearis
  • Oregon cliff fern Woodsia oregana
  • pale false mannagrass Torreyochloa pallida
  • Scouler's popcornflower Plagiobothrys scouleri
  • swamp verbena Verbena hastata
  • tall annual willowherb Epilobium brachycarpum
Also listed as native and introduced here 1

PLANTS labels these species both native and introduced in this state: some forms are native and others were brought in from elsewhere. Most gardeners should choose plants from the main list.

Compared with Idaho

The typical county is the median of the 44 Idaho counties with PLANTS county records; the statewide figure counts every species native anywhere in the state. More species is not better or worse: counties differ in size, habitat and how thoroughly they have been surveyed.

Native species counts, Lewis County and Idaho
MeasureLewis CountyTypical countyStatewide
Native species 71 302 975
Garden-ready natives 52 211 591
Tree 7 — 65
Shrub 11 — 97
Wildflower (forb) 45 — 552
Grass or grass-like 6 — 206
Vine 0 — 14
Fern 2 — 41

Neighboring counties

Counties that share a ZIP code with Lewis County.

Look up another ZIP

Matches your ZIP to the county it mostly lies in, then lists the plants recorded as native to your state (Kew’s World Checklist and USDA PLANTS) and recorded in that county by USDA PLANTS.

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.
Zones
USDA Plant Hardiness Zone Map (2023) ZIP table: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 3, 2026. Plant zones on this site are our estimate, not the official map.
Scope
Lewis County (county FIPS 16061), Idaho. 71 native species from PLANTS county distribution records; garden-ready = species with a PLANTS characteristics record.
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

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