Native plants · Washington

Native plants of Walla Walla County

375 plant species are recorded as native to Washington in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in Walla Walla County by USDA PLANTS. 253 of them have growing records you can filter by light, moisture, height and estimated cold hardiness. 4 more species are listed as both native and introduced and kept in a separate section.

County summary · USDA PLANTS and Kew WCVP

Walla Walla County, Washington

Native species: 375 Typical Washington county: 300 (median of 39 counties)
Garden-ready natives: 253 Typical Washington county: 219
Share by type (all 375 native species): Percent of the 375 native species in each growth type

Tree 9% (35)
Shrub 10% (37)
Wildflower (forb) 62% (232)
Grass or grass-like 15% (56)
Vine 1% (5)
Fern 3% (10)

Wildflowers make up the largest share of the native list (62%), followed by grasses and grass-like plants (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 zones 7a to 7b (2023 map).

The native plant list

Garden-ready natives 253

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

Garden-ready native plants of Walla Walla County, Washington
Plant	Type	Height	Light	Water use	Hardy to
Alaska oniongrass Melica subulata	Grass or grass-like	3.3 ft	Shade-tolerant	Medium	Zone 4a
alkali buttercup Ranunculus cymbalaria	Wildflower (forb)	1 ft	Shade-tolerant	High	Zone 3b
alpine leafybract aster Symphyotrichum foliaceum	Wildflower (forb)	2 ft	Sun	Medium	Zone 3b
American alpine speedwell Veronica wormskjoldii	Wildflower (forb)	1 ft	Sun–part shade	High	Zone 4b
American licorice Glycyrrhiza lepidota	Wildflower (forb)	4 ft	Sun–part shade	High	Zone 3b
American speedwell Veronica americana	Wildflower (forb)	10 in	Shade-tolerant	High	Zone 3b
American vetch Vicia americana	Vine	1.3 ft	Sun	Low	Zone 3b
American water horehound Lycopus americanus	Wildflower (forb)	1.8 ft	Shade-tolerant	High	Zone 3b
antelope bitterbrush Purshia tridentata	Shrub	6 ft	Sun–part shade	Low	Zone 3b
arrowleaf balsamroot Balsamorhiza sagittata	Wildflower (forb)	2 ft	Sun–part shade	Medium	Zone 3b
awlfruit sedge Carex stipata	Grass or grass-like	3.5 ft	Shade-tolerant	Medium	Zone 3b
ballhead waterleaf Hydrophyllum capitatum	Wildflower (forb)	1 ft	Shade-tolerant	High	Zone 4b
basin wildrye Leymus cinereus	Grass or grass-like	5 ft	Sun	High	Zone 3a
bearded fescue Festuca subulata	Grass or grass-like	1.2 ft	Shade-tolerant	High	Zone 3b
big sagebrush Artemisia tridentata	Tree	4 ft	Sun	Medium	Zone 3a
bigflower agoseris Agoseris grandiflora	Wildflower (forb)	1.8 ft	Sun	Medium	Zone 6a
bigseed biscuitroot Lomatium macrocarpum	Wildflower (forb)	6 in	Sun	Low	Zone 4b
bitter cherry Prunus emarginata	Tree	80 ft	Sun	Medium	Zone 5a
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 Mountain buckwheat Eriogonum strictum	Wildflower (forb)	2.2 ft	Sun	Low	Zone 5a
blue wildrye Elymus glaucus	Grass or grass-like	3.3 ft	Shade-tolerant	Low	Zone 3b
bluebunch wheatgrass Pseudoroegneria spicata	Grass or grass-like	3 ft	Sun	Low	Zone 3b
blunt spikerush Eleocharis obtusa	Grass or grass-like	1.6 ft	Sun	Medium	Zone 11a
bluntseed sweetroot Osmorhiza depauperata	Wildflower (forb)	2 ft	Shade-tolerant	Medium	Zone 4a
boxelder Acer negundo	Tree	60 ft	Shade-tolerant	Medium	Zone 2b
broadleaf arnica Arnica latifolia	Wildflower (forb)	2 ft	Sun–part shade	High	Zone 4a
broadleaf cattail Typha latifolia	Wildflower (forb)	5 ft	Sun–part shade	High	Zone 3b
broadlipped twayblade Listera convallarioides	Wildflower (forb)	1 ft	Shade-tolerant	High	Zone 3b
Brown's peony Paeonia brownii	Wildflower (forb)	1.5 ft	Sun–part shade	Medium	Zone 5a
bush penstemon Penstemon fruticosus	Shrub	2 ft	Sun	Medium	Zone 6a
California amaranth Amaranthus californicus	Wildflower (forb)	1 ft	Sun	Medium	Zone 7a
California blackberry Rubus ursinus	Shrub	2 ft	Sun	Medium	Zone 8a
California brome Bromus carinatus	Grass or grass-like	4 ft	Sun	Low	Zone 9a
California false hellebore Veratrum californicum	Wildflower (forb)	6 ft	Shade-tolerant	High	Zone 3b
California poppy Eschscholzia californica	Wildflower (forb)	1.2 ft	Sun–part shade	Low	Zone 8a
Canada goldenrod Solidago canadensis	Wildflower (forb)	3.5 ft	Sun	Medium	Zone 3a
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
Canadian milkvetch Astragalus canadensis	Wildflower (forb)	6 in	Sun	Medium	Zone 3b
Canadian waterweed Elodea canadensis	Wildflower (forb)	—	Sun	High	Zone 4a
Carey's balsamroot Balsamorhiza careyana	Wildflower (forb)	2.5 ft	Sun–part shade	Low	Zone 6a
Cascade barberry Mahonia nervosa	Shrub	2 ft	Shade-tolerant	Low	Zone 5b
Cascara buckthorn Frangula purshiana	Tree	35 ft	Shade-tolerant	Medium	Zone 7a
chamisso sedge Carex pachystachya	Grass or grass-like	3.5 ft	Shade-tolerant	Medium	Zone 3b
chokecherry Prunus virginiana	Tree	25 ft	Sun	Medium	Zone 3a
cloaked bulrush Scirpus pallidus	Grass or grass-like	5 ft	Sun	Medium	Zone 3b
clustered field sedge Carex praegracilis	Grass or grass-like	2 ft	Sun–part shade	Medium	Zone 3b
Columbia brome Bromus vulgaris	Grass or grass-like	1 ft	Shade-tolerant	Low	Zone 5a
Columbian monkshood Aconitum columbianum	Wildflower (forb)	5 ft	Sun–part shade	High	Zone 4b
common duckweed Lemna minor	Wildflower (forb)	—	Sun	High	Zone 3b
common selfheal Prunella vulgaris	Wildflower (forb)	1.5 ft	Sun–part shade	Medium	Zone 3b
common sneezeweed Helenium autumnale	Wildflower (forb)	4.9 ft	Sun	Medium	Zone 3a
common snowberry Symphoricarpos albus	Shrub	3 ft	Sun	Medium	Zone 3b
cous biscuitroot Lomatium cous	Wildflower (forb)	10 in	Sun	Low	Zone 4b
creeping barberry Mahonia repens	Shrub	2 ft	Shade-tolerant	Medium	Zone 5a
curl-leaf mountain mahogany Cercocarpus ledifolius	Tree	20 ft	Sun–part shade	Low	Zone 2b
cursed buttercup Ranunculus sceleratus	Wildflower (forb)	2 ft	Shade-tolerant	High	Zone 12b
curvepod yellowcress Rorippa curvisiliqua	Wildflower (forb)	1 ft	Shade-tolerant	High	Zone 12b
darkthroat shootingstar Dodecatheon pulchellum	Wildflower (forb)	2 ft	Sun–part shade	Medium	Zone 4a
dotted smartweed Polygonum punctatum	Wildflower (forb)	3.2 ft	Sun	Medium	Zone 10b
Douglas aster Symphyotrichum subspicatum	Wildflower (forb)	4 in	Sun–part shade	High	Zone 6b
Douglas-fir Pseudotsuga menziesii	Tree	200 ft	Sun–part shade	Medium	Zone 4a
Douglas' dustymaiden Chaenactis douglasii	Wildflower (forb)	1.6 ft	Sun–part shade	Low	Zone 3b
Douglas' grasswidow Olsynium douglasii	Wildflower (forb)	1 ft	Sun	Medium	Zone 5a
Douglas' onion Allium douglasii	Wildflower (forb)	11 in	Sun	Medium	Zone 4b
Douglas' sedge Carex douglasii	Grass or grass-like	1.5 ft	Sun	Medium	Zone 4a
drooping woodreed Cinna latifolia	Grass or grass-like	4.5 ft	Sun–part shade	High	Zone 3b
Drummond's rush Juncus drummondii	Grass or grass-like	1.5 ft	Sun–part shade	Medium	Zone 3b
dwarf rose Rosa gymnocarpa	Shrub	3 ft	Shade-tolerant	Medium	Zone 5b
Engelmann spruce Picea engelmannii	Tree	120 ft	Shade-tolerant	Medium	Zone 2a
false indigo bush Amorpha fruticosa	Shrub	15 ft	Sun	Low	Zone 3b
fernleaf biscuitroot Lomatium dissectum	Wildflower (forb)	15 ft	Sun–part shade	Low	Zone 8a
field horsetail Equisetum arvense	Fern	11 in	Sun–part shade	High	Zone 3a
foothill deathcamas Zigadenus paniculatus	Wildflower (forb)	1.6 ft	Sun	Medium	Zone 4a
Geyer's sedge Carex geyeri	Grass or grass-like	1.5 ft	Sun–part shade	Low	Zone 4b
giant goldenrod Solidago gigantea	Wildflower (forb)	8.2 ft	Sun–part shade	Medium	Zone 4a
glaucus willowherb Epilobium glaberrimum	Wildflower (forb)	2 ft	Shade-tolerant	Medium	Zone 6b
golden currant Ribes aureum	Shrub	10 ft	Sun–part shade	Low	Zone 3b
grand fir Abies grandis	Tree	150 ft	Shade-tolerant	Medium	Zone 4a
gray alder Alnus incana	Tree	25 ft	Sun–part shade	High	Zone 4a
greasewood Sarcobatus vermiculatus	Shrub	10 ft	Sun	Low	Zone 3b
green alder Alnus viridis	Tree	10 ft	Sun–part shade	High	Zone 1a
Greene's mountain ash Sorbus scopulina	Tree	12 ft	Sun–part shade	Medium	Zone 7a
grouse whortleberry Vaccinium scoparium	Shrub	2 ft	Shade-tolerant	Medium	Zone 6a
harsh Indian paintbrush Castilleja hispida	Wildflower (forb)	1.5 ft	Sun	Low	Zone 5a
heartleaf arnica Arnica cordifolia	Wildflower (forb)	1.5 ft	Shade-tolerant	High	Zone 4b
heartleaf bittercress Cardamine cordifolia	Wildflower (forb)	1.5 ft	Shade-tolerant	High	Zone 4b
hollyleaved barberry Mahonia aquifolium	Shrub	8 ft	Shade-tolerant	Low	Zone 3a
Idaho fescue Festuca idahoensis	Grass or grass-like	2 ft	Sun–part shade	Medium	Zone 3b
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
Jerusalem artichoke Helianthus tuberosus	Wildflower (forb)	9.8 ft	Sun–part shade	Low	Zone 3a
jointleaf rush Juncus articulatus	Grass or grass-like	2 ft	Sun–part shade	High	Zone 4b
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
largeflower triteleia Triteleia grandiflora	Wildflower (forb)	2 ft	Sun–part shade	Medium	Zone 4a
largeleaf avens Geum macrophyllum	Wildflower (forb)	2 ft	Shade-tolerant	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
little western bittercress Cardamine oligosperma	Wildflower (forb)	1.7 ft	Shade-tolerant	Medium	Zone 5a
lodgepole pine Pinus contorta	Tree	99 ft	Sun	Medium	Zone 1a
longleaf phlox Phlox longifolia	Wildflower (forb)	1.2 ft	Sun–part shade	Low	Zone 6a
longleaf pondweed Potamogeton nodosus	Wildflower (forb)	—	Sun	High	Zone 3b
longleaf starwort Stellaria longifolia	Wildflower (forb)	1.5 ft	Shade-tolerant	High	Zone 3b
longstalk clover Trifolium longipes	Wildflower (forb)	6 in	Sun–part shade	Medium	Zone 8a
low pussytoes Antennaria dimorpha	Wildflower (forb)	4 in	Sun–part shade	Low	Zone 3b
Lyall's angelica Angelica arguta	Wildflower (forb)	6 ft	Sun–part shade	High	Zone 5b
MacKenzie's willow Salix prolixa	Tree	45 ft	Sun	Low	Zone 2a
Macoun's buttercup Ranunculus macounii	Wildflower (forb)	1 ft	Sun	—	Zone 1a
maiden blue eyed Mary Collinsia parviflora	Wildflower (forb)	1 ft	Shade-tolerant	Medium	Zone 4a
mallow ninebark Physocarpus malvaceus	Shrub	15 ft	Sun	Low	Zone 4a
marsh seedbox Ludwigia palustris	Wildflower (forb)	2 in	Sun	High	Zone 4a
Mertens' rush Juncus mertensianus	Grass or grass-like	11 in	Sun–part shade	High	Zone 4a
miner's lettuce Claytonia perfoliata	Wildflower (forb)	1 ft	Shade-tolerant	Medium	Zone 12b
mule-ears Wyethia amplexicaulis	Wildflower (forb)	2.5 ft	Sun	Medium	Zone 3b
Munro's globemallow Sphaeralcea munroana	Wildflower (forb)	2.5 ft	Sun	Low	Zone 4b
narrowleaf willow Salix exigua	Tree	10 ft	Sun–part shade	High	Zone 3b
needle and thread Hesperostipa comata	Grass or grass-like	3 ft	Sun	Low	Zone 3b
nettleleaf giant hyssop Agastache urticifolia	Wildflower (forb)	5 ft	Sun–part shade	Medium	Zone 4a
nineleaf biscuitroot Lomatium triternatum	Wildflower (forb)	2.2 ft	Sun–part shade	Medium	Zone 4a
nodding beggartick Bidens cernua	Wildflower (forb)	3.2 ft	Sun–part shade	High	Zone 12a
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
northern black currant Ribes hudsonianum	Shrub	5 ft	Sun–part shade	High	Zone 4a
Northwest Territory sedge Carex utriculata	Grass or grass-like	3.5 ft	Sun	High	Zone 3a
Nuttall's povertyweed Monolepis nuttalliana	Wildflower (forb)	10 in	Sun	Medium	Zone 12a
oceanspray Holodiscus discolor	Shrub	12 ft	Sun	High	Zone 8a
old man's whiskers Geum triflorum	Wildflower (forb)	1.5 ft	Sun–part shade	Medium	Zone 3b
oneflower helianthella Helianthella uniflora	Wildflower (forb)	2 ft	Sun–part shade	Low	Zone 5a
Oregon checkerbloom Sidalcea oregana	Wildflower (forb)	4.5 ft	Shade-tolerant	High	Zone 3b
Pacific aster Symphyotrichum chilense	Wildflower (forb)	3.5 ft	Sun–part shade	Medium	Zone 4b
Pacific ninebark Physocarpus capitatus	Shrub	8 ft	Sun	Low	Zone 4a
Pacific silver fir Abies amabilis	Tree	165 ft	Shade-tolerant	Medium	Zone 4b
Pacific yew Taxus brevifolia	Tree	40 ft	Shade-tolerant	Low	Zone 5b
pale agoseris Agoseris glauca	Shrub	1 ft	Sun	Medium	Zone 4a
pale evening primrose Oenothera pallida	Wildflower (forb)	2 ft	Sun	Low	Zone 3b
panicled bulrush Scirpus microcarpus	Grass or grass-like	5.5 ft	Sun	Medium	Zone 3b
paper birch Betula papyrifera	Tree	70 ft	Sun	High	Zone 1a
peachleaf willow Salix amygdaloides	Tree	60 ft	Sun	High	Zone 4a
pearly pussytoes Antennaria anaphaloides	Wildflower (forb)	2.5 ft	Sun–part shade	Medium	Zone 4a
Pennsylvania bittercress Cardamine pensylvanica	Wildflower (forb)	1.5 ft	Shade-tolerant	Medium	Zone 4a
Philadelphia fleabane Erigeron philadelphicus	Wildflower (forb)	2.8 ft	Sun–part shade	Medium	Zone 4b
pinegrass Calamagrostis rubescens	Grass or grass-like	3 ft	Shade-tolerant	Medium	Zone 4b
pinkfairies Clarkia pulchella	Wildflower (forb)	2 ft	Sun–part shade	Medium	Zone 12a
pipsissewa Chimaphila umbellata	Shrub	1.5 ft	Shade-tolerant	Low	Zone 3b
ponderosa pine Pinus ponderosa	Tree	223 ft	Sun	Medium	Zone 3b
prairie fleabane Erigeron strigosus	Wildflower (forb)	3 ft	Sun	Medium	Zone 4b
prairie Junegrass Koeleria macrantha	Grass or grass-like	1.5 ft	Shade-tolerant	High	Zone 3b
prickly currant Ribes lacustre	Shrub	3 ft	Shade-tolerant	—	Zone 1a
purple sage Salvia dorrii	Shrub	2.5 ft	Sun	Medium	Zone 5a
red elderberry Sambucus racemosa	Tree	18 ft	Sun–part shade	High	Zone 4a
red goosefoot Chenopodium rubrum	Wildflower (forb)	3 ft	Sun	High	Zone 12b
redosier dogwood Cornus sericea	Tree	12 ft	Sun	High	Zone 3b
redroot flatsedge Cyperus erythrorhizos	Grass or grass-like	2.5 ft	Sun	Medium	Zone 11a
redstem ceanothus Ceanothus sanguineus	Shrub	10 ft	Sun–part shade	High	Zone 6a
reed canarygrass Phalaris arundinacea	Grass or grass-like	5 ft	Sun	High	Zone 3b
ribbonleaf pondweed Potamogeton epihydrus	Wildflower (forb)	—	Sun	High	Zone 4a
Rocky Mountain beeplant Cleome serrulata	Wildflower (forb)	3 ft	Sun–part shade	Medium	Zone 12b
Rocky Mountain iris Iris missouriensis	Wildflower (forb)	1 ft	Sun–part shade	High	Zone 4b
Rocky Mountain maple Acer glabrum	Tree	30 ft	Sun–part shade	Low	Zone 3a
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
rush pussytoes Antennaria luzuloides	Wildflower (forb)	2 ft	Sun	Medium	Zone 4a
sagebrush buttercup Ranunculus glaberrimus	Wildflower (forb)	6 in	Sun	High	Zone 3a
sagebrush mariposa lily Calochortus macrocarpus	Wildflower (forb)	1.8 ft	Sun	Low	Zone 5a
sago pondweed Stuckenia pectinata	Wildflower (forb)	—	Sun	High	Zone 3b
salt heliotrope Heliotropium curassavicum	Wildflower (forb)	1.2 ft	Sun	Medium	Zone 4b
sand dropseed Sporobolus cryptandrus	Grass or grass-like	3 ft	Sun	Low	Zone 3b
Sandberg bluegrass Poa secunda	Grass or grass-like	1.4 ft	Sun–part shade	Low	Zone 3b
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
scabland penstemon Penstemon deustus	Wildflower (forb)	2 ft	Sun	Low	Zone 4a
scabland sagebrush Artemisia rigida	Shrub	2 ft	Sun	Low	Zone 3a
scarlet gilia Ipomopsis aggregata	Wildflower (forb)	3 ft	Sun	Low	Zone 5b
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
serrate balsamroot Balsamorhiza serrata	Wildflower (forb)	1 ft	Sun	Low	Zone 4b
sharpleaf penstemon Penstemon acuminatus	Wildflower (forb)	2 ft	Sun	Low	Zone 4a
shining willow Salix lucida	Tree	13 ft	Sun–part shade	High	Zone 3a
shiny chickweed Stellaria nitens	Wildflower (forb)	10 in	Shade-tolerant	Medium	Zone 12a
shortawn foxtail Alopecurus aequalis	Grass or grass-like	2.5 ft	Sun–part shade	High	Zone 3b
showy milkweed Asclepias speciosa	Wildflower (forb)	6 ft	Sun	Medium	Zone 4a
Siberian springbeauty Claytonia sibirica	Wildflower (forb)	1.4 ft	Shade-tolerant	Medium	Zone 3a
Sierra larkspur Delphinium glaucum	Wildflower (forb)	8 ft	Shade-tolerant	High	Zone 4b
silky lupine Lupinus sericeus	Wildflower (forb)	6 ft	Sun	Low	Zone 4b
silverleaf phacelia Phacelia hastata	Wildflower (forb)	2 ft	Sun–part shade	Medium	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
slender clarkia Clarkia gracilis	Wildflower (forb)	2.5 ft	Sun–part shade	Medium	Zone 12b
small camas Camassia quamash	Wildflower (forb)	2.3 ft	Shade-tolerant	High	Zone 4b
small enchanter's nightshade Circaea alpina	Wildflower (forb)	11 in	Shade-tolerant	Medium	Zone 3b
smallflowered woodrush Luzula parviflora	Grass or grass-like	2 ft	Shade-tolerant	High	Zone 4a
smallwing sedge Carex microptera	Grass or grass-like	2 ft	Sun	High	Zone 4a
smooth blue aster Symphyotrichum laeve	Wildflower (forb)	4 ft	Sun	Medium	Zone 3a
smooth horsetail Equisetum laevigatum	Fern	5 ft	Sun	Low	Zone 3b
smooth sumac Rhus glabra	Tree	12 ft	Sun	Low	Zone 4a
snow buckwheat Eriogonum niveum	Wildflower (forb)	1.5 ft	Sun–part shade	Low	Zone 5a
softstem bulrush Schoenoplectus tabernaemontani	Grass or grass-like	9 ft	Sun	High	Zone 3b
spike bentgrass Agrostis exarata	Grass or grass-like	3 ft	Sun	Medium	Zone 3b
spike trisetum Trisetum spicatum	Grass or grass-like	1.9 ft	Sun–part shade	Medium	Zone 3b
spiny hopsage Grayia spinosa	Shrub	3 ft	Sun	Low	Zone 4a
squashberry Viburnum edule	Shrub	2 ft	Shade-tolerant	—	Zone 1a
squirreltail Elymus elymoides	Grass or grass-like	1.5 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
subalpine fir Abies lasiocarpa	Tree	90 ft	Shade-tolerant	Medium	Zone 2a
sulphur lupine Lupinus sulphureus	Wildflower (forb)	10 ft	Sun	Low	Zone 4a
sulphur-flower buckwheat Eriogonum umbellatum	Shrub	1 ft	Sun	Low	Zone 8a
swordleaf rush Juncus ensifolius	Grass or grass-like	2 ft	Sun–part shade	High	Zone 3b
tall groundsel Senecio hydrophiloides	Wildflower (forb)	10 in	Shade-tolerant	High	Zone 4b
tall woolly buckwheat Eriogonum elatum	Wildflower (forb)	3 ft	Sun	Low	Zone 4b
tarweed fiddleneck Amsinckia lycopsoides	Wildflower (forb)	3 ft	Sun	Low	Zone 4b
teal lovegrass Eragrostis hypnoides	Grass or grass-like	4 in	Sun	High	Zone 3b
thickspike wheatgrass Elymus lanceolatus	Grass or grass-like	2.3 ft	Sun	Low	Zone 3b
thickstem aster Eurybia integrifolia	Wildflower (forb)	3 ft	Sun	Low	Zone 5a
thimbleberry Rubus parviflorus	Shrub	4 ft	Sun–part shade	High	Zone 4b
thinleaf huckleberry Vaccinium membranaceum	Shrub	4.5 ft	Sun–part shade	Low	Zone 3b
threadleaf fleabane Erigeron filifolius	Wildflower (forb)	1 ft	Sun	Low	Zone 6a
tiny mousetail Myosurus minimus	Wildflower (forb)	5 in	Sun–part shade	Medium	Zone 12b
toad rush Juncus bufonius	Grass or grass-like	1 ft	Sun	Medium	Zone 12a
Torrey's rush Juncus torreyi	Grass or grass-like	3.1 ft	Sun	Medium	Zone 3b
Utah honeysuckle Lonicera utahensis	Shrub	5 ft	Shade-tolerant	High	Zone 5a
Venus penstemon Penstemon venustus	Shrub	2 ft	Sun–part shade	Medium	Zone 5b
water birch Betula occidentalis	Tree	25 ft	Sun–part shade	High	Zone 1a
water horsetail Equisetum fluviatile	Fern	3 ft	Sun	High	Zone 4a
western columbine Aquilegia formosa	Wildflower (forb)	3 ft	Shade-tolerant	Medium	Zone 5a
western fescue Festuca occidentalis	Grass or grass-like	3 ft	Shade-tolerant	Low	Zone 3a
western goldentop Euthamia occidentalis	Wildflower (forb)	6 ft	Sun	Medium	Zone 4b
western juniper Juniperus occidentalis	Tree	33 ft	Sun	Low	Zone 4a
western larch Larix occidentalis	Tree	200 ft	Sun	Low	Zone 3a
western pearly everlasting Anaphalis margaritacea	Wildflower (forb)	3 ft	Sun–part shade	Medium	Zone 3a
western polemonium Polemonium occidentale	Wildflower (forb)	3 ft	Shade-tolerant	High	Zone 3a
western stoneseed Lithospermum ruderale	Wildflower (forb)	1.5 ft	Sun	Low	Zone 4b
western sweetroot Osmorhiza occidentalis	Wildflower (forb)	4 ft	Shade-tolerant	Medium	Zone 3b
western swordfern Polystichum munitum	Fern	3.5 ft	Shade-tolerant	High	Zone 4a
western water hemlock Cicuta douglasii	Wildflower (forb)	6 ft	Sun	High	Zone 4b
western white clematis Clematis ligusticifolia	Vine	1 ft	Sun–part shade	Medium	Zone 3b
white alder Alnus rhombifolia	Tree	65 ft	Shade-tolerant	High	Zone 5a
white hawkweed Hieracium albiflorum	Wildflower (forb)	3 ft	Sun–part shade	Low	Zone 4a
white sagebrush Artemisia ludoviciana	Wildflower (forb)	3 ft	Sun	Low	Zone 4a
whitebark raspberry Rubus leucodermis	Vine	1 ft	Sun	Medium	Zone 8a
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 fritillary Fritillaria pudica	Wildflower (forb)	1 ft	Sun–part shade	Medium	Zone 12a
yellow rabbitbrush Chrysothamnus viscidiflorus	Shrub	3 ft	Sun	Low	Zone 5a
yellow spiderflower Cleome lutea	Wildflower (forb)	2.7 ft	Sun	Low	Zone 12a
yellow wildrye Leymus flavescens	Grass or grass-like	3 ft	Sun	Medium	Zone 5b

Other native species recorded here 122

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 bird's-foot trefoil Lotus unifoliolatus
American mannagrass Glyceria grandis
American yellowrocket Barbarea orthoceras
arroyo willow Salix lasiolepis
bastard toadflax Comandra umbellata
biannual lettuce Lactuca ludoviciana
Bicknell's cranesbill Geranium bicknellii
big devils beggartick Bidens vulgata
bigbract verbena Verbena bracteata
bog yellowcress Rorippa palustris
boreal starwort Stellaria borealis
brittle bladderfern Cystopteris fragilis
brook cinquefoil Potentilla rivalis
Canadian gooseberry Ribes oxyacanthoides
carelessweed Cyclachaena xanthiifolia
Carolina draba Draba reptans
Carolina geranium Geranium carolinianum
chairmaker's bulrush Schoenoplectus americanus
cottonbatting plant Pseudognaphalium stramineum
Cuman ragweed Ambrosia psilostachya
curlycup gumweed Grindelia squarrosa
curlytop knotweed Polygonum lapathifolium
cutleaf nightshade Solanum triflorum
desert goosefoot Chenopodium pratericola
Douglas' knotweed Polygonum douglasii
Dudley's rush Juncus dudleyi
dutchman's breeches Dicentra cucullaria
dwarf scouringrush Equisetum scirpoides
eastern daisy fleabane Erigeron annuus
European bur-reed Sparganium emersum
fairy slipper Calypso bulbosa
feathery false lily of the valley Maianthemum racemosum
fineleaf hymenopappus Hymenopappus filifolius
flatspine bur ragweed Ambrosia acanthicarpa
flatspine stickseed Lappula occidentalis
foxtail barley Hordeum jubatum
fringed willowherb Epilobium ciliatum
giant red Indian paintbrush Castilleja miniata
Gmelin's buttercup Ranunculus gmelinii
great ragweed Ambrosia trifida
green carpetweed Mollugo verticillata
green false hellebore Veratrum viride
hairy evening primrose Oenothera villosa
hoary tansyaster Machaeranthera canescens
hooded coralroot Corallorhiza striata
hookedspur violet Viola adunca
Hornemann's willowherb Epilobium hornemannii
Indianpipe Monotropa uniflora
knotsheath sedge Carex retrorsa
lanceleaf figwort Scrophularia lanceolata
largeleaf sandwort Moehringia macrophylla
lemon scurfpea Psoralidium lanceolatum
lesser wirelettuce Stephanomeria minor
manyflowered monkeyflower Mimulus floribundus
mapleleaf goosefoot Chenopodium simplex
marsh horsetail Equisetum palustre
marsh violet Viola palustris
mat sandbur Cenchrus longispinus
meadow deathcamas Zigadenus venenosus
Menzies' campion Silene menziesii
Menzies' fiddleneck Amsinckia menziesii
Mexican Mosquito Fern Azolla microphylla
milkflower willowherb Epilobium lactiflorum
mountain tansymustard Descurainia incana
mountain tarweed Madia glomerata
muskflower Mimulus moschatus
narrowleaf goosefoot Chenopodium leptophyllum
narrowleaf minerslettuce Montia linearis
neckweed Veronica peregrina
needleleaf navarretia Navarretia intertexta
nodding chickweed Cerastium nutans
northern water plantain Alisma triviale
Norwegian cinquefoil Potentilla norvegica
Oregon cliff fern Woodsia oregana
pale spikerush Eleocharis macrostachya
Pennsylvania pellitory Parietaria pensylvanica
pleated gentian Gentiana affinis
purple marshlocks Comarum palustre
red baneberry Actaea rubra
ribseed sandmat Chamaesyce glyptosperma
Rocky Mountain rush Juncus saximontanus
rough barnyardgrass Echinochloa muricata
rusty lupine Lupinus pusillus
scentbottle Platanthera dilatata
Scouler's popcornflower Plagiobothrys scouleri
shaggy fleabane Erigeron pumilus
sidebells wintergreen Orthilia secunda
sixweeks fescue Vulpia octoflora
slender phlox Microsteris gracilis
slender-spire orchid Piperia unalascensis
small pondweed Potamogeton pusillus
spiny phlox Phlox hoodii
spreading dogbane Apocynum androsaemifolium
spring forget-me-not Myosotis verna
starry false lily of the valley Maianthemum stellatum
summer coralroot Corallorhiza maculata
swamp verbena Verbena hastata
sweetcicely Osmorhiza berteroi
tall annual willowherb Epilobium brachycarpum
tall blue lettuce Lactuca biennis
tiny trumpet Collomia linearis
turion duckweed Lemna turionifera
twinflower Linnaea borealis
veiny dock Rumex venosus
velvetweed Oenothera curtiflora
Virginia pepperweed Lepidium virginicum
Virginia strawberry Fragaria virginiana
western marsh cudweed Gnaphalium palustre
western oakfern Gymnocarpium dryopteris
western poison ivy Toxicodendron rydbergii
western rattlesnake plantain Goodyera oblongifolia
western tansymustard Descurainia pinnata
white heath aster Symphyotrichum ericoides
whitestem blazingstar Mentzelia albicaulis
wild cucumber Echinocystis lobata
witchgrass Panicum capillare
woodland draba Draba nemorosa
woodland pinedrops Pterospora andromedea
woodland strawberry Fragaria vesca
woolly sedge Carex pellita
yellow coralroot Corallorhiza trifida
yellowseed false pimpernel Lindernia dubia

Also listed as native and introduced here 4

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.

biennial wormwoodArtemisia biennis
claspleaf twistedstalkStreptopus amplexifolius
common reedPhragmites australis
Kentucky bluegrassPoa pratensis

Compared with Washington

The typical county is the median of the 39 Washington 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, Walla Walla County and Washington
Measure	Walla Walla County	Typical county	Statewide
Native species	375	300	1,015
Garden-ready natives	253	219	621
Tree	35	—	74
Shrub	37	—	99
Wildflower (forb)	232	—	547
Grass or grass-like	56	—	234
Vine	5	—	16
Fern	10	—	45

Neighboring counties

Counties that share a ZIP code with Walla Walla County.

Umatilla County, OR 330 garden-ready
Columbia County, WA 219 garden-ready

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: Walla Walla County (county FIPS 53071), Washington. 375 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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