Natives by ZIP

Native plants recorded in your state and county

Native plants · Montana

Native plants of Petroleum County

151 plant species are recorded as native to Montana in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in Petroleum County by USDA PLANTS. 90 of them have growing records you can filter by light, moisture, height and estimated cold hardiness. 2 more species are listed as both native and introduced and kept in a separate section.

County summary · USDA PLANTS and Kew WCVP

Petroleum County, Montana

Native species
151 Typical Montana county: 161 (median of 56 counties)
Garden-ready natives
90 Typical Montana county: 104
Share by type (all 151 native species)
Percent of the 151 native species in each growth type
Tree 7% (11)
Shrub 17% (25)
Wildflower (forb) 60% (91)
Grass or grass-like 13% (19)
Vine 3% (4)
Fern <1% (1)

Wildflowers make up the largest share of the native list (60%), followed by shrubs (17%).

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 4b (2023 map).

The native plant list

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

Garden-ready natives 90

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

Garden-ready native plants of Petroleum County, Montana
PlantType HeightLight Water useHardy to
alkali buttercup Ranunculus cymbalaria Wildflower (forb) 1 ft Shade-tolerant High Zone 3b
alkali cordgrass Spartina gracilis Grass or grass-like 3 ft Sun Medium Zone 3b
alkali sacaton Sporobolus airoides Grass or grass-like 3 ft Sun Low Zone 3b
American licorice Glycyrrhiza lepidota Wildflower (forb) 4 ft Sun–part shade High Zone 3b
American vetch Vicia americana Vine 1.3 ft Sun Low Zone 3b
balsam poplar Populus balsamifera Tree 80 ft Sun High Zone 1a
big sagebrush Artemisia tridentata Tree 4 ft Sun Medium Zone 3a
black hawthorn Crataegus douglasii Tree 15 ft Sun–part shade High Zone 2b
blanketflower Gaillardia aristata Wildflower (forb) 2 ft Sun Medium Zone 4a
blue grama Bouteloua gracilis Grass or grass-like 1 ft Sun Medium Zone 3a
bluebunch wheatgrass Pseudoroegneria spicata Grass or grass-like 3 ft Sun Low Zone 3b
broom snakeweed Gutierrezia sarothrae Shrub 1.5 ft Sun Medium Zone 3b
Canada wildrye Elymus canadensis Grass or grass-like 3 ft Shade-tolerant Medium Zone 3a
Canadian horseweed Conyza canadensis Wildflower (forb) 5 ft Sun Medium Zone 12b
chokecherry Prunus virginiana Tree 25 ft Sun Medium Zone 3a
common selfheal Prunella vulgaris Wildflower (forb) 1.5 ft Sun–part shade Medium Zone 3b
common snowberry Symphoricarpos albus Shrub 3 ft Sun Medium Zone 3b
cosmopolitan bulrush Bolboschoenus maritimus Grass or grass-like 3.2 ft Sun Medium Zone 5a
creeping barberry Mahonia repens Shrub 2 ft Shade-tolerant Medium Zone 5a
creeping juniper Juniperus horizontalis Shrub 4 ft Sun High Zone 3a
cutleaf daisy Erigeron compositus Wildflower (forb) 1 ft Sun Low Zone 4a
dotted blazing star Liatris punctata Wildflower (forb) 2 ft Sun Medium Zone 3a
Douglas' dustymaiden Chaenactis douglasii Wildflower (forb) 1.6 ft Sun–part shade Low Zone 3b
downy paintedcup Castilleja sessiliflora Wildflower (forb) 1.3 ft Sun Low Zone 3b
eastern cottonwood Populus deltoides Tree 190 ft Sun High Zone 3a
fourwing saltbush Atriplex canescens Shrub 4 ft Sun Medium Zone 3a
fowl bluegrass Poa palustris Grass or grass-like 4 ft Sun–part shade Medium Zone 3b
Gardner's saltbush Atriplex gardneri Shrub 4 ft Sun Low Zone 3b
giant goldenrod Solidago gigantea Wildflower (forb) 8.2 ft Sun–part shade Medium Zone 4a
golden currant Ribes aureum Shrub 10 ft Sun–part shade Low Zone 3b
golden tickseed Coreopsis tinctoria Wildflower (forb) 3 ft Sun–part shade High Zone 12b
greasewood Sarcobatus vermiculatus Shrub 10 ft Sun Low Zone 3b
green needlegrass Nassella viridula Grass or grass-like 2 ft Sun Low Zone 3b
hairy false goldenaster Heterotheca villosa Wildflower (forb) 3 ft Sun Low Zone 4a
Indian ricegrass Achnatherum hymenoides Grass or grass-like 2 ft Sun Low Zone 3a
Indianhemp Apocynum cannabinum Wildflower (forb) 3.3 ft Sun–part shade High Zone 3a
kinnikinnick Arctostaphylos uva-ursi Shrub 6 in Sun–part shade Low Zone 4a
lambstongue ragwort Senecio integerrimus Wildflower (forb) 1.1 ft Sun–part shade Medium Zone 3b
largeflower hawksbeard Crepis occidentalis Wildflower (forb) 11 in Sun Low Zone 5a
mallow ninebark Physocarpus malvaceus Shrub 15 ft Sun Low Zone 4a
Missouri goldenrod Solidago missouriensis Wildflower (forb) 3 ft Sun–part shade Low Zone 3b
northern bedstraw Galium boreale Wildflower (forb) 3 ft Sun–part shade Medium Zone 4a
pale agoseris Agoseris glauca Shrub 1 ft Sun Medium Zone 4a
Pennsylvania smartweed Polygonum pensylvanicum Wildflower (forb) 3.9 ft Sun Medium Zone 10b
plains pricklypear Opuntia polyacantha Shrub 2 ft Sun Low Zone 4b
ponderosa pine Pinus ponderosa Tree 223 ft Sun Medium Zone 3b
prairie Junegrass Koeleria macrantha Grass or grass-like 1.5 ft Shade-tolerant High Zone 3b
prairie sagewort Artemisia frigida Shrub 2 ft Sun–part shade Low Zone 3a
purple locoweed Oxytropis lambertii Wildflower (forb) 1.4 ft Sun Low Zone 3b
purple milkvetch Astragalus agrestis Wildflower (forb) 1 ft Sun Low Zone 4a
purple prairie clover Dalea purpurea Wildflower (forb) 3 ft Sun Medium Zone 3b
redosier dogwood Cornus sericea Tree 12 ft Sun High Zone 3b
Rocky Mountain beeplant Cleome serrulata Wildflower (forb) 3 ft Sun–part shade Medium Zone 12b
Rocky Mountain juniper Juniperus scopulorum Tree 50 ft Sun Low Zone 3b
Rocky Mountain maple Acer glabrum Tree 30 ft Sun–part shade Low Zone 3a
rubber rabbitbrush Ericameria nauseosa Shrub 4 ft Sun Medium Zone 3b
russet buffaloberry Shepherdia canadensis Shrub 6 ft Sun–part shade Medium Zone 1a
saltgrass Distichlis spicata Grass or grass-like 1.1 ft Sun Medium Zone 3b
sandbar willow Salix interior Tree 30 ft Sun — Zone 1a
sanddune wallflower Erysimum capitatum Wildflower (forb) 2.5 ft Sun Medium Zone 4b
Saskatoon serviceberry Amelanchier alnifolia Tree 15 ft Sun–part shade Medium Zone 1a
scarlet globemallow Sphaeralcea coccinea Wildflower (forb) 1.5 ft Sun Low Zone 5a
shadscale saltbush Atriplex confertifolia Shrub 3 ft Sun Medium Zone 3b
showy milkweed Asclepias speciosa Wildflower (forb) 6 ft Sun Medium Zone 4a
silver sagebrush Artemisia cana Shrub 5 ft Sun Low Zone 3a
silvery lupine Lupinus argenteus Wildflower (forb) 1.5 ft Sun Low Zone 3a
skunkbush sumac Rhus trilobata Shrub 4 ft Sun–part shade Low Zone 2a
slender cinquefoil Potentilla gracilis Wildflower (forb) 2.4 ft Sun Low Zone 3a
slender wheatgrass Elymus trachycaulus Grass or grass-like 3 ft Sun Medium Zone 3b
soapweed yucca Yucca glauca Shrub 1 ft Sun Low Zone 4b
stiff goldenrod Oligoneuron rigidum Wildflower (forb) 3.6 ft Sun–part shade Medium Zone 3a
tanseyleaf tansyaster Machaeranthera tanacetifolia Wildflower (forb) 2 ft Sun Medium Zone 4a
tapertip hawksbeard Crepis acuminata Wildflower (forb) 3 ft Sun–part shade Low Zone 3b
textile onion Allium textile Wildflower (forb) 1 ft Sun–part shade Medium Zone 3b
threadleaf sedge Carex filifolia Grass or grass-like 1.2 ft Sun Low Zone 3b
tufted evening primrose Oenothera caespitosa Wildflower (forb) 6 in Sun Low Zone 6a
upright prairie coneflower Ratibida columnifera Wildflower (forb) 3.1 ft Sun Medium Zone 3a
wax currant Ribes cereum Shrub 3 ft Sun Low Zone 5a
western snowberry Symphoricarpos occidentalis Shrub 3 ft Sun–part shade Low Zone 3b
western white clematis Clematis ligusticifolia Vine 1 ft Sun–part shade Medium Zone 3b
white prairie clover Dalea candida Wildflower (forb) 2 ft Sun–part shade Medium Zone 3b
whitebark raspberry Rubus leucodermis Vine 1 ft Sun Medium Zone 8a
wild bergamot Monarda fistulosa Wildflower (forb) 4.9 ft Sun–part shade High Zone 4a
winterfat Krascheninnikovia lanata Shrub 2 ft Sun Low Zone 2a
Woods' rose Rosa woodsii Shrub 3 ft Sun–part shade Medium Zone 3a
woolly groundsel Packera cana Wildflower (forb) 1.5 ft Sun Low Zone 3a
woolly plantain Plantago patagonica Wildflower (forb) 6 in Sun Low Zone 12b
woollypod milkvetch Astragalus purshii Wildflower (forb) 7 in Sun Low Zone 4a
yellow evening primrose Oenothera flava Wildflower (forb) 2.5 ft Sun–part shade Medium Zone 4a
yellow rabbitbrush Chrysothamnus viscidiflorus Shrub 3 ft Sun Low Zone 5a

Other native species recorded here 61

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.

  • American sloughgrass Beckmannia syzigachne
  • annual buckwheat Eriogonum annuum
  • bastard toadflax Comandra umbellata
  • Bicknell's cranesbill Geranium bicknellii
  • big devils beggartick Bidens vulgata
  • bigbract verbena Verbena bracteata
  • brittle bladderfern Cystopteris fragilis
  • clasping Venus' looking-glass Triodanis perfoliata
  • curlycup gumweed Grindelia squarrosa
  • curlytop knotweed Polygonum lapathifolium
  • cutleaf nightshade Solanum triflorum
  • desert biscuitroot Lomatium foeniculaceum
  • Douglas' knotweed Polygonum douglasii
  • fineleaf hymenopappus Hymenopappus filifolius
  • flatspine stickseed Lappula occidentalis
  • Flodman's thistle Cirsium flodmanii
  • foothill bladderpod Lesquerella ludoviciana
  • foxtail barley Hordeum jubatum
  • great ragweed Ambrosia trifida
  • hedge false bindweed Calystegia sepium
  • hoary tansyaster Machaeranthera canescens
  • lacy tansyaster Machaeranthera pinnatifida
  • large Indian breadroot Pediomelum esculentum
  • Laxmann's milkvetch Astragalus laxmannii
  • Louisiana broomrape Orobanche ludoviciana
  • mapleleaf goosefoot Chenopodium simplex
  • meadow deathcamas Zigadenus venenosus
  • narrowleaf four o'clock Mirabilis linearis
  • narrowleaf goosefoot Chenopodium leptophyllum
  • needleleaf sedge Carex duriuscula
  • nodding onion Allium cernuum
  • pale spikerush Eleocharis macrostachya
  • plains springparsley Cymopterus acaulis
  • povertyweed Iva axillaris
  • prairie false dandelion Nothocalais cuspidata
  • prairie rose Rosa arkansana
  • prairie sunflower Helianthus petiolaris
  • redwhisker clammyweed Polanisia dodecandra
  • ribseed sandmat Chamaesyce glyptosperma
  • rough false pennyroyal Hedeoma hispida
  • rush skeletonplant Lygodesmia juncea
  • rusty lupine Lupinus pusillus
  • scarlet beeblossom Oenothera suffrutescens
  • Scouler's popcornflower Plagiobothrys scouleri
  • seaside arrowgrass Triglochin maritima
  • shaggy fleabane Erigeron pumilus
  • shortbeak sedge Carex brevior
  • silverleaf Indian breadroot Pediomelum argophyllum
  • silverscale saltbush Atriplex argentea
  • sleepy silene Silene antirrhina
  • slimflower scurfpea Psoralidium tenuiflorum
  • small-leaf pussytoes Antennaria parvifolia
  • spiny phlox Phlox hoodii
  • spreading fleabane Erigeron divergens
  • starry false lily of the valley Maianthemum stellatum
  • stemless four-nerve daisy Tetraneuris acaulis
  • tower rockcress Arabis glabra
  • velvety goldenrod Solidago mollis
  • wavyleaf thistle Cirsium undulatum
  • white prairie aster Symphyotrichum falcatum
  • whitest evening primrose Oenothera albicaulis
Also listed as native and introduced here 2

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 Montana

The typical county is the median of the 56 Montana 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, Petroleum County and Montana
MeasurePetroleum CountyTypical countyStatewide
Native species 151 161 1,086
Garden-ready natives 90 104 606
Tree 11 — 71
Shrub 25 — 98
Wildflower (forb) 91 — 609
Grass or grass-like 19 — 246
Vine 4 — 18
Fern 1 — 44

Neighboring counties

Counties that share a ZIP code with Petroleum 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
Petroleum County (county FIPS 30069), Montana. 151 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

Independent reference site. No government affiliation or endorsement.