Native plants · California

Native plants of Siskiyou County

603 plant species are recorded as native to California in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in Siskiyou County by USDA PLANTS. 435 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

Siskiyou County, California

Native species: 603 Typical California county: 333 (median of 58 counties)
Garden-ready natives: 435 Typical California county: 239
Share by type (all 603 native species): Percent of the 603 native species in each growth type

Tree 11% (65)
Shrub 12% (70)
Wildflower (forb) 53% (322)
Grass or grass-like 21% (125)
Vine 1% (7)
Fern 2% (14)

Wildflowers make up the largest share of the native list (53%), followed by grasses and grass-like plants (21%).

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 6b to 8b (2023 map).

The native plant list

Garden-ready natives 435

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

Garden-ready native plants of Siskiyou County, California
Plant	Type	Height	Light	Water use	Hardy to
Alaska cedar Callitropsis nootkatensis	Tree	75 ft	Shade-tolerant	Medium	Zone 5a
Alaska oniongrass Melica subulata	Grass or grass-like	3.3 ft	Shade-tolerant	Medium	Zone 4a
alpine laurel Kalmia microphylla	Shrub	1 ft	Shade-tolerant	Medium	Zone 4b
alpine leafybract aster Symphyotrichum foliaceum	Wildflower (forb)	2 ft	Sun	Medium	Zone 3b
alpine mountainsorrel Oxyria digyna	Wildflower (forb)	1 ft	Sun–part shade	Medium	Zone 3a
alpine timothy Phleum alpinum	Grass or grass-like	1.4 ft	Sun–part shade	Medium	Zone 3a
American alpine speedwell Veronica wormskjoldii	Wildflower (forb)	1 ft	Sun–part shade	High	Zone 4b
American bistort Polygonum bistortoides	Wildflower (forb)	1.5 ft	Sun	High	Zone 3b
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
analogue sedge Carex simulata	Grass or grass-like	1.5 ft	Sun–part shade	High	Zone 3b
Anderson's larkspur Delphinium andersonii	Wildflower (forb)	2 ft	Shade-tolerant	Low	Zone 5b
annual hairgrass Deschampsia danthonioides	Grass or grass-like	1.5 ft	Sun–part shade	Medium	Zone 12b
antelope bitterbrush Purshia tridentata	Shrub	6 ft	Sun–part shade	Low	Zone 3b
arctic pearlwort Sagina saginoides	Wildflower (forb)	4 in	Sun–part shade	High	Zone 4a
arctic sweet coltsfoot Petasites frigidus	Wildflower (forb)	10 in	Sun–part shade	High	Zone 3b
arrowleaf balsamroot Balsamorhiza sagittata	Wildflower (forb)	2 ft	Sun–part shade	Medium	Zone 3b
arrowleaf ragwort Senecio triangularis	Wildflower (forb)	4 ft	Sun–part shade	High	Zone 4a
arumleaf arrowhead Sagittaria cuneata	Wildflower (forb)	2.6 ft	Sun	Medium	Zone 4a
awlfruit sedge Carex stipata	Grass or grass-like	3.5 ft	Shade-tolerant	Medium	Zone 3b
basalt milkvetch Astragalus filipes	Wildflower (forb)	2 ft	Sun	Low	Zone 5a
basin wildrye Leymus cinereus	Grass or grass-like	5 ft	Sun	High	Zone 3a
beaked hazelnut Corylus cornuta	Tree	15 ft	Shade-tolerant	Medium	Zone 2b
bearded fescue Festuca subulata	Grass or grass-like	1.2 ft	Shade-tolerant	High	Zone 3b
beardless wildrye Leymus triticoides	Grass or grass-like	3 ft	Sun	High	Zone 3a
big deervetch Lotus crassifolius	Wildflower (forb)	3.5 ft	Sun	Medium	Zone 7a
big sagebrush Artemisia tridentata	Tree	4 ft	Sun	Medium	Zone 3a
bigflower agoseris Agoseris grandiflora	Wildflower (forb)	1.8 ft	Sun	Medium	Zone 6a
bigleaf maple Acer macrophyllum	Tree	60 ft	Sun–part shade	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
black sagebrush Artemisia nova	Shrub	2 ft	Sun	Low	Zone 5a
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
bog birch Betula pumila	Shrub	20 ft	Sun	Medium	Zone 3b
bog blueberry Vaccinium uliginosum	Shrub	2 ft	Sun–part shade	Medium	Zone 3b
Booth's willow Salix boothii	Shrub	24 ft	Shade-tolerant	High	Zone 8b
boraxweed Nitrophila occidentalis	Wildflower (forb)	1 ft	Sun	Medium	Zone 6a
boreal sagebrush Artemisia arctica	Shrub	1.5 ft	—	—	Zone 1a
boxelder Acer negundo	Tree	60 ft	Shade-tolerant	Medium	Zone 2b
Brewer spruce Picea breweriana	Tree	100 ft	Shade-tolerant	Medium	Zone 6a
Brewer's bittercress Cardamine breweri	Wildflower (forb)	1.8 ft	Shade-tolerant	Medium	Zone 5b
brickellbush aster Eucephalus brickellioides	Wildflower (forb)	2 ft	Sun	Low	Zone 8a
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
broadleaf lupine Lupinus latifolius	Wildflower (forb)	25 ft	Shade-tolerant	High	Zone 5b
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
buckbrush Ceanothus cuneatus	Shrub	11 ft	Sun	Medium	Zone 6a
bush chinquapin Chrysolepis sempervirens	Shrub	7 ft	Shade-tolerant	Low	Zone 6b
bushy bird's beak Cordylanthus ramosus	Wildflower (forb)	1 ft	Sun–part shade	Medium	Zone 12b
California amaranth Amaranthus californicus	Wildflower (forb)	1 ft	Sun	Medium	Zone 7a
California black oak Quercus kelloggii	Tree	85 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 buckeye Aesculus californica	Tree	25 ft	Sun–part shade	Medium	Zone 7b
California buckthorn Frangula californica	Tree	5 ft	Sun	Medium	Zone 8a
California damsonium Damasonium californicum	Wildflower (forb)	1.5 ft	Sun	High	Zone 5a
California false hellebore Veratrum californicum	Wildflower (forb)	6 ft	Shade-tolerant	High	Zone 3b
California fescue Festuca californica	Grass or grass-like	4 ft	Sun	Medium	Zone 8a
California laurel Umbellularia californica	Tree	80 ft	Shade-tolerant	High	Zone 6a
California melicgrass Melica californica	Grass or grass-like	4 ft	Sun–part shade	Low	Zone 8a
California oatgrass Danthonia californica	Grass or grass-like	2 ft	Sun	Medium	Zone 9a
California poppy Eschscholzia californica	Wildflower (forb)	1.2 ft	Sun–part shade	Low	Zone 8a
California red fir Abies magnifica	Tree	150 ft	Shade-tolerant	Medium	Zone 5a
California wildrose Rosa californica	Shrub	10 ft	Sun–part shade	High	Zone 8a
California yerba santa Eriodictyon californicum	Shrub	8 ft	Sun	Low	Zone 7a
Canada goldenrod Solidago canadensis	Wildflower (forb)	3.5 ft	Sun	Medium	Zone 3a
Canadian horseweed Conyza canadensis	Wildflower (forb)	5 ft	Sun	Medium	Zone 12b
Canadian waterweed Elodea canadensis	Wildflower (forb)	—	Sun	High	Zone 4a
Canby's biscuitroot Lomatium canbyi	Wildflower (forb)	10 in	Sun	Low	Zone 4b
canyon live oak Quercus chrysolepis	Tree	90 ft	Shade-tolerant	Medium	Zone 8b
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 arnica Arnica chamissonis	Wildflower (forb)	2.5 ft	Sun–part shade	High	Zone 4a
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
clasping arnica Arnica amplexicaulis	Wildflower (forb)	2.5 ft	Shade-tolerant	High	Zone 5a
cluster rose Rosa pisocarpa	Shrub	3 ft	Sun	—	Zone 5a
clustered field sedge Carex praegracilis	Grass or grass-like	2 ft	Sun–part shade	Medium	Zone 3b
Colorado rush Juncus confusus	Grass or grass-like	1.5 ft	Sun–part shade	High	Zone 3b
Columbia brome Bromus vulgaris	Grass or grass-like	1 ft	Shade-tolerant	Low	Zone 5a
Columbia needlegrass Achnatherum nelsonii	Grass or grass-like	3 ft	Sun	Low	Zone 4b
Columbian monkshood Aconitum columbianum	Wildflower (forb)	5 ft	Sun–part shade	High	Zone 4b
common beargrass Xerophyllum tenax	Wildflower (forb)	5 ft	Sun–part shade	Low	Zone 8a
common buttonbush Cephalanthus occidentalis	Tree	15 ft	Shade-tolerant	High	Zone 4a
common cowparsnip Heracleum maximum	Wildflower (forb)	8 ft	Sun	High	Zone 3b
common juniper Juniperus communis	Tree	10 ft	Sun	Low	Zone 3a
common maidenhair Adiantum capillus-veneris	Fern	1.7 ft	Shade-tolerant	High	Zone 4a
common mare's-tail Hippuris vulgaris	Wildflower (forb)	2.8 ft	Sun	High	Zone 3b
common rush Juncus effusus	Grass or grass-like	6.6 ft	Sun	Medium	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
common sunflower Helianthus annuus	Wildflower (forb)	9 ft	Sun	Medium	Zone 12b
coon's tail Ceratophyllum demersum	Wildflower (forb)	—	Sun–part shade	High	Zone 3b
cosmopolitan bulrush Bolboschoenus maritimus	Grass or grass-like	3.2 ft	Sun	Medium	Zone 5a
cows clover Trifolium wormskioldii	Wildflower (forb)	3.5 ft	Sun–part shade	Medium	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 milkvetch Astragalus curvicarpus	Wildflower (forb)	5 in	Sun	Low	Zone 5a
curvepod yellowcress Rorippa curvisiliqua	Wildflower (forb)	1 ft	Shade-tolerant	High	Zone 12b
cutleaf daisy Erigeron compositus	Wildflower (forb)	1 ft	Sun	Low	Zone 4a
Davis' knotweed Polygonum davisiae	Wildflower (forb)	1.3 ft	Sun–part shade	Low	Zone 5a
deerbrush Ceanothus integerrimus	Shrub	13 ft	Sun	Low	Zone 6a
desert sweet Chamaebatiaria millefolium	Shrub	6 ft	Sun	Low	Zone 5a
desert yellow fleabane Erigeron linearis	Wildflower (forb)	1 ft	Sun	Low	Zone 5a
devil's beggartick Bidens frondosa	Wildflower (forb)	4 ft	Sun–part shade	Medium	Zone 12a
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' 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 rockcress Arabis drummondii	Wildflower (forb)	2 ft	Sun–part shade	Medium	Zone 3b
Drummond's rush Juncus drummondii	Grass or grass-like	1.5 ft	Sun–part shade	Medium	Zone 3b
dwarf bilberry Vaccinium cespitosum	Shrub	1 ft	Shade-tolerant	High	Zone 4a
dwarf purple monkeyflower Mimulus nanus	Wildflower (forb)	6 in	Sun	Low	Zone 10b
dwarf rose Rosa gymnocarpa	Shrub	3 ft	Shade-tolerant	Medium	Zone 5b
dwarf spikerush Eleocharis parvula	Grass or grass-like	1.2 ft	Sun	Medium	Zone 3b
Eaton's fleabane Erigeron eatonii	Wildflower (forb)	10 in	Sun	Low	Zone 5b
elephanthead lousewort Pedicularis groenlandica	Wildflower (forb)	2.5 ft	Sun–part shade	High	Zone 4a
Engelmann spruce Picea engelmannii	Tree	120 ft	Shade-tolerant	Medium	Zone 2a
Eschscholtz's buttercup Ranunculus eschscholtzii	Wildflower (forb)	1 ft	Sun	Medium	Zone 4a
fall panicgrass Panicum dichotomiflorum	Grass or grass-like	3.3 ft	Sun	High	Zone 3a
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
fireweed Chamerion angustifolium	Wildflower (forb)	5.5 ft	Sun–part shade	High	Zone 3b
floating pondweed Potamogeton natans	Wildflower (forb)	—	Sun	High	Zone 3b
foothill arnica Arnica fulgens	Wildflower (forb)	2 ft	Shade-tolerant	Medium	Zone 4b
foothill deathcamas Zigadenus paniculatus	Wildflower (forb)	1.6 ft	Sun	Medium	Zone 4a
fowl mannagrass Glyceria striata	Grass or grass-like	5.7 ft	Shade-tolerant	Medium	Zone 3b
fox sedge Carex vulpinoidea	Grass or grass-like	3.2 ft	Sun–part shade	Medium	Zone 3b
freckled milkvetch Astragalus lentiginosus	Shrub	1.4 ft	Sun	Low	Zone 4b
fringed grass of Parnassus Parnassia fimbriata	Wildflower (forb)	1.2 ft	Sun–part shade	High	Zone 4b
Gardner's yampah Perideridia gairdneri	Wildflower (forb)	4 ft	Shade-tolerant	High	Zone 5b
giant chinquapin Chrysolepis chrysophylla	Tree	100 ft	Shade-tolerant	Medium	Zone 4a
glaucous bluegrass Poa glauca	Grass or grass-like	2 ft	Sun	—	Zone 3a
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
golden sedge Carex aurea	Grass or grass-like	1.2 ft	Sun–part shade	High	Zone 4a
golden spiderflower Cleome platycarpa	Wildflower (forb)	2 ft	Sun	Medium	Zone 12b
gooseberry currant Ribes montigenum	Shrub	1 ft	Sun–part shade	Medium	Zone 7a
grand fir Abies grandis	Tree	150 ft	Shade-tolerant	Medium	Zone 4a
granite prickly phlox Linanthus pungens	Wildflower (forb)	2 ft	Shade-tolerant	Low	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
greater creeping spearwort Ranunculus flammula	Wildflower (forb)	1.5 ft	Shade-tolerant	High	Zone 4a
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
greenleaf fescue Festuca viridula	Grass or grass-like	2.5 ft	Sun–part shade	Medium	Zone 4a
greenleaf manzanita Arctostaphylos patula	Shrub	6 ft	Sun–part shade	Medium	Zone 4b
grouse whortleberry Vaccinium scoparium	Shrub	2 ft	Shade-tolerant	Medium	Zone 6a
hairy arnica Arnica mollis	Wildflower (forb)	2 ft	Sun–part shade	High	Zone 4a
Hall's sedge Carex halliana	Grass or grass-like	2.5 ft	Sun	Medium	Zone 4a
hardstem bulrush Schoenoplectus acutus	Grass or grass-like	9.8 ft	Sun	High	Zone 3b
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
hooded lady's tresses Spiranthes romanzoffiana	Wildflower (forb)	2.5 ft	Sun–part shade	High	Zone 3b
Hooker's balsamroot Balsamorhiza hookeri	Wildflower (forb)	1 ft	Sun–part shade	Medium	Zone 5b
Hooker's evening primrose Oenothera elata	Wildflower (forb)	5 ft	Sun	High	Zone 5a
huckleberry oak Quercus vacciniifolia	Shrub	1.3 ft	Shade-tolerant	Low	Zone 4b
Idaho bentgrass Agrostis idahoensis	Grass or grass-like	1.4 ft	Sun	Medium	Zone 3b
Idaho blue-eyed grass Sisyrinchium idahoense	Wildflower (forb)	1.7 ft	Shade-tolerant	High	Zone 3b
Idaho fescue Festuca idahoensis	Grass or grass-like	2 ft	Sun–part shade	Medium	Zone 3b
incense cedar Calocedrus decurrens	Tree	100 ft	Sun–part shade	Low	Zone 4b
Indian plum Oemleria cerasiformis	Tree	5 ft	Sun–part shade	—	Zone 10a
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
inland sedge Carex interior	Grass or grass-like	1.5 ft	Sun–part shade	High	Zone 3b
Jeffrey pine Pinus jeffreyi	Tree	180 ft	Sun	Medium	Zone 3b
Klamath plum Prunus subcordata	Tree	25 ft	Sun	Low	Zone 4b
knotgrass Paspalum distichum	Grass or grass-like	11 in	Sun	High	Zone 6a
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
largehead clover Trifolium macrocephalum	Wildflower (forb)	2 ft	Sun–part shade	Low	Zone 12b
largeleaf avens Geum macrophyllum	Wildflower (forb)	2 ft	Shade-tolerant	Medium	Zone 4a
leafy pea Lathyrus polyphyllus	Vine	2.7 ft	Sun–part shade	Medium	Zone 7b
leafy pondweed Potamogeton foliosus	Wildflower (forb)	—	Sun	High	Zone 3b
Lemmon's needlegrass Achnatherum lemmonii	Grass or grass-like	3 ft	Sun	Low	Zone 4b
Lemmon's willow Salix lemmonii	Shrub	14 ft	Sun–part shade	High	Zone 4b
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 sagebrush Artemisia arbuscula	Shrub	2 ft	Sun	Low	Zone 3a
lodgepole pine Pinus contorta	Tree	99 ft	Sun	Medium	Zone 1a
longstalk clover Trifolium longipes	Wildflower (forb)	6 in	Sun–part shade	Medium	Zone 8a
longstalk starwort Stellaria longipes	Wildflower (forb)	11 in	Sun–part shade	High	Zone 4a
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
maiden blue eyed Mary Collinsia parviflora	Wildflower (forb)	1 ft	Shade-tolerant	Medium	Zone 4a
Mariposa sedge Carex mariposana	Grass or grass-like	2 ft	Shade-tolerant	Low	Zone 6a
marsh seedbox Ludwigia palustris	Wildflower (forb)	2 in	Sun	High	Zone 4a
marumleaf buckwheat Eriogonum marifolium	Wildflower (forb)	10 in	Sun	Low	Zone 5b
mat muhly Muhlenbergia richardsonis	Grass or grass-like	6 in	Sun	High	Zone 4b
meadow barley Hordeum brachyantherum	Grass or grass-like	2 ft	Sun	Medium	Zone 3a
Mertens' rush Juncus mertensianus	Grass or grass-like	11 in	Sun–part shade	High	Zone 4a
Mertens' sedge Carex mertensii	Grass or grass-like	3.5 ft	Shade-tolerant	Medium	Zone 4b
Mexican rush Juncus mexicanus	Grass or grass-like	10 in	Sun	Medium	Zone 5b
miner's lettuce Claytonia perfoliata	Wildflower (forb)	1 ft	Shade-tolerant	Medium	Zone 12b
Modoc hawksbeard Crepis modocensis	Wildflower (forb)	1.4 ft	Sun	Low	Zone 4b
mountain blue penstemon Penstemon laetus	Wildflower (forb)	2.5 ft	Sun	Medium	Zone 8b
mountain brome Bromus marginatus	Grass or grass-like	4 ft	Sun	High	Zone 4b
mountain hemlock Tsuga mertensiana	Tree	125 ft	Shade-tolerant	High	Zone 5b
mountain muhly Muhlenbergia montana	Grass or grass-like	1.5 ft	Sun	Medium	Zone 3b
mountain pepperweed Lepidium montanum	Wildflower (forb)	10 in	Sun–part shade	Low	Zone 4a
mountain pride Penstemon newberryi	Wildflower (forb)	1 ft	Sun–part shade	Low	Zone 5a
mountain sedge Carex scopulorum	Grass or grass-like	1.3 ft	Sun–part shade	High	Zone 3b
mud sedge Carex limosa	Grass or grass-like	1.8 ft	Sun	Medium	Zone 4a
narrowleaf water plantain Alisma gramineum	Wildflower (forb)	1.5 ft	Sun	High	Zone 3a
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 and thread Hesperostipa comata	Grass or grass-like	3 ft	Sun	Low	Zone 3b
needle spikerush Eleocharis acicularis	Grass or grass-like	8 in	Sun	Medium	Zone 5a
nettleleaf giant hyssop Agastache urticifolia	Wildflower (forb)	5 ft	Sun–part shade	Medium	Zone 4a
noble fir Abies procera	Tree	230 ft	Sun–part shade	Low	Zone 5a
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
nodding waternymph Najas flexilis	Wildflower (forb)	2.5 ft	Sun–part shade	High	Zone 12a
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 alkaligrass Puccinellia nuttalliana	Grass or grass-like	10 in	Sun	Medium	Zone 3b
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
onespike danthonia Danthonia unispicata	Grass or grass-like	10 in	Sun	Low	Zone 4b
oniongrass Melica bulbosa	Grass or grass-like	1.8 ft	Sun–part shade	Low	Zone 3a
orange agoseris Agoseris aurantiaca	Wildflower (forb)	1 ft	Sun	Medium	Zone 4a
Oregon ash Fraxinus latifolia	Tree	70 ft	Sun–part shade	Medium	Zone 6b
Oregon bedstraw Galium oreganum	Wildflower (forb)	1 ft	Shade-tolerant	Low	Zone 6a
Oregon checkerbloom Sidalcea oregana	Wildflower (forb)	4.5 ft	Shade-tolerant	High	Zone 3b
Oregon geranium Geranium oreganum	Wildflower (forb)	3 ft	Shade-tolerant	High	Zone 8a
Oregon white oak Quercus garryana	Tree	80 ft	Sun	Low	Zone 4a
Pacific anemone Anemone multifida	Wildflower (forb)	2 ft	Shade-tolerant	Medium	Zone 5a
Pacific aster Symphyotrichum chilense	Wildflower (forb)	3.5 ft	Sun–part shade	Medium	Zone 4b
Pacific bleeding heart Dicentra formosa	Wildflower (forb)	1.5 ft	Shade-tolerant	Low	Zone 5a
Pacific dogwood Cornus nuttallii	Tree	50 ft	Shade-tolerant	Medium	Zone 4b
Pacific madrone Arbutus menziesii	Tree	80 ft	Sun–part shade	Low	Zone 8b
Pacific ninebark Physocarpus capitatus	Shrub	8 ft	Sun	Low	Zone 4a
Pacific onion Allium validum	Wildflower (forb)	2 ft	Sun–part shade	High	Zone 5b
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 yellow lupine Lupinus luteolus	Wildflower (forb)	2.9 ft	Sun–part shade	Medium	Zone 12b
panicled bulrush Scirpus microcarpus	Grass or grass-like	5.5 ft	Sun	Medium	Zone 3b
Parish's yampah Perideridia parishii	Wildflower (forb)	2.5 ft	Shade-tolerant	High	Zone 4a
Parry's rush Juncus parryi	Grass or grass-like	1 ft	Sun–part shade	Low	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
pinemat manzanita Arctostaphylos nevadensis	Shrub	2 ft	Shade-tolerant	Low	Zone 6a
pipsissewa Chimaphila umbellata	Shrub	1.5 ft	Shade-tolerant	Low	Zone 3b
plantainleaf buttercup Ranunculus alismifolius	Wildflower (forb)	2 ft	Sun–part shade	High	Zone 4a
ponderosa pine Pinus ponderosa	Tree	223 ft	Sun	Medium	Zone 3b
Port Orford cedar Chamaecyparis lawsoniana	Tree	200 ft	Shade-tolerant	Medium	Zone 6a
poverty rush Juncus tenuis	Grass or grass-like	1.5 ft	Sun–part shade	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
primrose monkeyflower Mimulus primuloides	Wildflower (forb)	1.5 ft	Shade-tolerant	High	Zone 4a
prostrate ceanothus Ceanothus prostratus	Shrub	6 in	Shade-tolerant	Low	Zone 5a
purple sage Salvia dorrii	Shrub	2.5 ft	Sun	Medium	Zone 5a
quaking aspen Populus tremuloides	Tree	65 ft	Sun	High	Zone 1a
Rainier pleated gentian Gentiana calycosa	Wildflower (forb)	7 in	Shade-tolerant	Medium	Zone 8a
rattlesnake fern Botrychium virginianum	Fern	1.4 ft	Shade-tolerant	Medium	Zone 3b
rayless arnica Arnica ×diversifolia	Wildflower (forb)	1.3 ft	Sun–part shade	High	Zone 5a
Raynolds' sedge Carex raynoldsii	Grass or grass-like	2 ft	Shade-tolerant	Medium	Zone 4a
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
red huckleberry Vaccinium parvifolium	Shrub	12 ft	Shade-tolerant	Low	Zone 6a
redflower currant Ribes sanguineum	Shrub	12 ft	Sun–part shade	Medium	Zone 8a
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
rice cutgrass Leersia oryzoides	Grass or grass-like	4.9 ft	Sun	High	Zone 4a
Richardson's geranium Geranium richardsonii	Wildflower (forb)	3 ft	Sun–part shade	High	Zone 3b
Robbins' pondweed Potamogeton robbinsii	Wildflower (forb)	—	Sun	High	Zone 3b
rock buckwheat Eriogonum sphaerocephalum	Shrub	1 ft	Sun	Low	Zone 5a
rockloving erigeron Erigeron petrophilus	Wildflower (forb)	1 ft	Shade-tolerant	Low	Zone 8a
Rocky Mountain beeplant Cleome serrulata	Wildflower (forb)	3 ft	Sun–part shade	Medium	Zone 12b
Rocky Mountain goldenrod Solidago multiradiata	Wildflower (forb)	1 ft	Sun	—	Zone 1a
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
rose spirea Spiraea douglasii	Shrub	7 ft	Sun	Low	Zone 5a
Ross' sedge Carex rossii	Grass or grass-like	1 ft	Sun–part shade	Medium	Zone 4a
rough bentgrass Agrostis scabra	Grass or grass-like	2.5 ft	Sun	Medium	Zone 3b
roundleaf alumroot Heuchera cylindrica	Wildflower (forb)	6 ft	Sun–part shade	Low	Zone 6a
royal penstemon Penstemon speciosus	Wildflower (forb)	2.5 ft	Sun	Low	Zone 4a
rubber rabbitbrush Ericameria nauseosa	Shrub	4 ft	Sun	Medium	Zone 3b
rufous bulrush Scirpus pendulus	Grass or grass-like	4 ft	Sun	Medium	Zone 3b
Rydberg's penstemon Penstemon rydbergii	Wildflower (forb)	3 ft	Sun	Low	Zone 3b
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
saltgrass Distichlis spicata	Grass or grass-like	1.1 ft	Sun	Medium	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
scarlet gilia Ipomopsis aggregata	Wildflower (forb)	3 ft	Sun	Low	Zone 5b
scarlet monkeyflower Mimulus cardinalis	Wildflower (forb)	2.5 ft	Shade-tolerant	High	Zone 4b
Scouler's willow Salix scouleriana	Tree	50 ft	Sun–part shade	High	Zone 6a
Scouler's woollyweed Hieracium scouleri	Wildflower (forb)	2 ft	Sun	Medium	Zone 4a
scratchgrass Muhlenbergia asperifolia	Grass or grass-like	2 ft	Shade-tolerant	High	Zone 5b
sea milkwort Glaux maritima	Wildflower (forb)	11 in	Sun	High	Zone 4a
seashore bentgrass Agrostis pallens	Grass or grass-like	2 ft	Sun–part shade	High	Zone 5a
seep monkeyflower Mimulus guttatus	Wildflower (forb)	2.5 ft	Shade-tolerant	High	Zone 3b
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
shorthair reedgrass Calamagrostis breweri	Grass or grass-like	5 ft	Sun	High	Zone 4b
showy milkweed Asclepias speciosa	Wildflower (forb)	6 ft	Sun	Medium	Zone 4a
shrubby cinquefoil Dasiphora fruticosa	Shrub	2.5 ft	Sun–part shade	Low	Zone 4b
Siberian springbeauty Claytonia sibirica	Wildflower (forb)	1.4 ft	Shade-tolerant	Medium	Zone 3a
sicklekeel lupine Lupinus albicaulis	Wildflower (forb)	3 ft	Sun	Medium	Zone 12a
Sierra currant Ribes nevadense	Shrub	6 ft	Sun–part shade	High	Zone 4b
Sierra gooseberry Ribes roezlii	Shrub	5 ft	Sun–part shade	Low	Zone 4b
Sierra larkspur Delphinium glaucum	Wildflower (forb)	8 ft	Shade-tolerant	High	Zone 4b
Sierra rush Juncus nevadensis	Grass or grass-like	2 ft	Sun–part shade	High	Zone 4a
Sierra willow Salix orestera	Shrub	10 ft	Sun	High	Zone 5a
silver sagebrush Artemisia cana	Shrub	5 ft	Sun	Low	Zone 3a
silverleaf phacelia Phacelia hastata	Wildflower (forb)	2 ft	Sun–part shade	Medium	Zone 3b
silverweed cinquefoil Argentina anserina	Wildflower (forb)	6 in	Shade-tolerant	High	Zone 5a
silvery lupine Lupinus argenteus	Wildflower (forb)	1.5 ft	Sun	Low	Zone 3a
Sitka willow Salix sitchensis	Tree	23 ft	Sun	High	Zone 5b
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 clarkia Clarkia gracilis	Wildflower (forb)	2.5 ft	Sun–part shade	Medium	Zone 12b
slender cottongrass Eriophorum gracile	Grass or grass-like	1.7 ft	Sun	High	Zone 3a
slender flatsedge Cyperus bipartitus	Grass or grass-like	5 ft	Sun	Medium	Zone 10b
slender hairgrass Deschampsia elongata	Grass or grass-like	3 ft	Sun	Low	Zone 3b
slender wheatgrass Elymus trachycaulus	Grass or grass-like	3 ft	Sun	Medium	Zone 3b
slenderbeak sedge Carex athrostachya	Grass or grass-like	2 ft	Sun–part shade	High	Zone 4a
slimstem reedgrass Calamagrostis stricta	Grass or grass-like	3 ft	Sun–part shade	High	Zone 3a
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
small floating mannagrass Glyceria borealis	Grass or grass-like	4.9 ft	Sun	High	Zone 4a
small white violet Viola macloskeyi	Wildflower (forb)	6 in	Shade-tolerant	High	Zone 4b
smallflowered woodrush Luzula parviflora	Grass or grass-like	2 ft	Shade-tolerant	High	Zone 4a
smallleaf giant hyssop Agastache parvifolia	Wildflower (forb)	2 ft	Sun	Low	Zone 5a
smallwing sedge Carex microptera	Grass or grass-like	2 ft	Sun	High	Zone 4a
smooth beggartick Bidens laevis	Wildflower (forb)	3.3 ft	Sun–part shade	High	Zone 12b
smooth horsetail Equisetum laevigatum	Fern	5 ft	Sun	Low	Zone 3b
snowbrush ceanothus Ceanothus velutinus	Tree	10 ft	Sun	Medium	Zone 5a
softstem bulrush Schoenoplectus tabernaemontani	Grass or grass-like	9 ft	Sun	High	Zone 3b
spearleaf arnica Arnica longifolia	Wildflower (forb)	2 ft	Shade-tolerant	High	Zone 4a
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
spineless horsebrush Tetradymia canescens	Shrub	4 ft	Sun	Low	Zone 9a
spreading phlox Phlox diffusa	Wildflower (forb)	6 in	Shade-tolerant	Low	Zone 6a
spreadingpod rockcress Arabis ×divaricarpa	Wildflower (forb)	3 ft	Shade-tolerant	Low	Zone 4b
squashberry Viburnum edule	Shrub	2 ft	Shade-tolerant	—	Zone 1a
squirreltail Elymus elymoides	Grass or grass-like	1.5 ft	Sun	Low	Zone 3a
star sedge Carex echinata	Grass or grass-like	1.5 ft	Sun–part shade	High	Zone 3b
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
subalpine fir Abies lasiocarpa	Tree	90 ft	Shade-tolerant	Medium	Zone 2a
sugar pine Pinus lambertiana	Tree	229 ft	Sun–part shade	Medium	Zone 4b
Suksdorf's monkeyflower Mimulus suksdorfii	Wildflower (forb)	7 in	Shade-tolerant	Medium	Zone 12b
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
tailcup lupine Lupinus caudatus	Wildflower (forb)	5 ft	Sun	Low	Zone 4b
tall groundsel Senecio hydrophiloides	Wildflower (forb)	10 in	Shade-tolerant	High	Zone 4b
tall trisetum Trisetum canescens	Grass or grass-like	3.5 ft	Sun–part shade	Medium	Zone 4a
tall woolly buckwheat Eriogonum elatum	Wildflower (forb)	3 ft	Sun	Low	Zone 4b
tanoak Notholithocarpus densiflorus	Tree	125 ft	Shade-tolerant	Medium	Zone 8a
tapertip flatsedge Cyperus acuminatus	Grass or grass-like	1.3 ft	Sun–part shade	High	Zone 3b
tapertip hawksbeard Crepis acuminata	Wildflower (forb)	3 ft	Sun–part shade	Low	Zone 3b
tapertip onion Allium acuminatum	Wildflower (forb)	1 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
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
three-way sedge Dulichium arundinaceum	Grass or grass-like	2.6 ft	Sun–part shade	High	Zone 3b
threepetal bedstraw Galium trifidum	Vine	10 in	Sun–part shade	High	Zone 3b
Thurber's needlegrass Achnatherum thurberianum	Grass or grass-like	2 ft	Sun	Low	Zone 5a
timber oatgrass Danthonia intermedia	Grass or grass-like	1.5 ft	Sun–part shade	Low	Zone 4a
tinker's penny Hypericum anagalloides	Wildflower (forb)	10 in	Sun–part shade	High	Zone 12a
toad rush Juncus bufonius	Grass or grass-like	1 ft	Sun	Medium	Zone 12a
toughleaf iris Iris tenax	Wildflower (forb)	1.5 ft	Shade-tolerant	Medium	Zone 6a
tufted hairgrass Deschampsia cespitosa	Grass or grass-like	3.4 ft	Sun	Low	Zone 3b
tufted loosestrife Lysimachia thyrsiflora	Wildflower (forb)	2 ft	Sun–part shade	High	Zone 4a
twoheaded water-starwort Callitriche heterophylla	Wildflower (forb)	—	Sun	High	Zone 4a
umbrella starwort Stellaria umbellata	Wildflower (forb)	1 ft	Shade-tolerant	High	Zone 4b
Utah serviceberry Amelanchier utahensis	Tree	15 ft	Sun–part shade	Medium	Zone 4b
variableleaf pondweed Potamogeton gramineus	Wildflower (forb)	—	Sun	High	Zone 3b
vernal water-starwort Callitriche palustris	Wildflower (forb)	10 in	Sun	Medium	Zone 4a
vine maple Acer circinatum	Tree	20 ft	Shade-tolerant	Medium	Zone 6a
water birch Betula occidentalis	Tree	25 ft	Sun–part shade	High	Zone 1a
water knotweed Polygonum amphibium	Wildflower (forb)	1 in	Sun	High	Zone 5a
water sedge Carex aquatilis	Grass or grass-like	2.9 ft	Sun	High	Zone 3b
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 azalea Rhododendron occidentale	Shrub	10 ft	Sun–part shade	High	Zone 8b
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 Labrador tea Ledum glandulosum	Shrub	4.5 ft	Shade-tolerant	Medium	Zone 4b
western mountain ash Sorbus sitchensis	Tree	15 ft	Sun	Medium	Zone 4b
western needlegrass Achnatherum occidentale	Grass or grass-like	2 ft	Sun–part shade	Low	Zone 4b
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 waterleaf Hydrophyllum occidentale	Wildflower (forb)	1.5 ft	Shade-tolerant	Medium	Zone 5b
western white clematis Clematis ligusticifolia	Vine	1 ft	Sun–part shade	Medium	Zone 3b
western white pine Pinus monticola	Tree	200 ft	Sun–part shade	Medium	Zone 4a
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 marsh marigold Caltha leptosepala	Wildflower (forb)	1 ft	Sun	High	Zone 4a
whitebark pine Pinus albicaulis	Tree	65 ft	Sun–part shade	Medium	Zone 1b
whitebark raspberry Rubus leucodermis	Vine	1 ft	Sun	Medium	Zone 8a
whitestem gooseberry Ribes inerme	Shrub	8 ft	Shade-tolerant	Medium	Zone 4b
whitethorn ceanothus Ceanothus cordulatus	Shrub	8 ft	Sun	Low	Zone 5a
woodrush sedge Carex luzulina	Grass or grass-like	2 ft	Sun	High	Zone 4a
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 mule-ears Wyethia mollis	Wildflower (forb)	2.5 ft	Shade-tolerant	Low	Zone 6a
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 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 willow Salix lutea	Tree	16 ft	Sun–part shade	High	Zone 3a

Other native species recorded here 168

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.

Aleutian maidenhair Adiantum aleuticum
alpine lewisia Lewisia pygmaea
alpine pondweed Potamogeton alpinus
American bird's-foot trefoil Lotus unifoliolatus
American black nightshade Solanum americanum
American rockbrake Cryptogramma acrostichoides
American sloughgrass Beckmannia syzigachne
American yellowrocket Barbarea orthoceras
annual muhly Muhlenbergia minutissima
arroyo willow Salix lasiolepis
autumn dwarf gentian Gentianella amarella
ballhead ipomopsis Ipomopsis congesta
bastard toadflax Comandra umbellata
bearded flatsedge Cyperus squarrosus
beautiful sandwort Minuartia rubella
Bebb willow Salix bebbiana
Bicknell's cranesbill Geranium bicknellii
bigbract verbena Verbena bracteata
bigleaf lupine Lupinus polyphyllus
blite goosefoot Chenopodium capitatum
bluntleaf yellowcress Rorippa curvipes
bog yellowcress Rorippa palustris
boreal starwort Stellaria borealis
brittle bladderfern Cystopteris fragilis
brittle pricklypear Opuntia fragilis
brook cinquefoil Potentilla rivalis
buffalobur nightshade Solanum rostratum
buttonbush dodder Cuscuta cephalanthi
Canada lettuce Lactuca canadensis
Carolina geranium Geranium carolinianum
chairmaker's bulrush Schoenoplectus americanus
claspleaf twistedstalk Streptopus amplexifolius
clustered broomrape Orobanche fasciculata
common bladderwort Utricularia macrorhiza
common starlily Leucocrinum montanum
cottonbatting plant Pseudognaphalium stramineum
curlytop knotweed Polygonum lapathifolium
cushion draba Draba breweri
cutleaf nightshade Solanum triflorum
desert goosefoot Chenopodium pratericola
ditch rabbitsfoot grass Polypogon interruptus
Douglas' knotweed Polygonum douglasii
Dudley's rush Juncus dudleyi
elkweed Frasera speciosa
Engelmann's spikerush Eleocharis engelmannii
English sundew Drosera anglica
Equisetum ×ferrissii Equisetum ×ferrissii
fairy slipper Calypso bulbosa
false mermaidweed Floerkea proserpinacoides
feathery false lily of the valley Maianthemum racemosum
fewflower spikerush Eleocharis quinqueflora
foxtail barley Hordeum jubatum
foxtail muhly Muhlenbergia andina
fragrant bedstraw Galium triflorum
fringed willowherb Epilobium ciliatum
giant red Indian paintbrush Castilleja miniata
green false hellebore Veratrum viride
hairy evening primrose Oenothera villosa
hairy hedgenettle Stachys pilosa
heartleaf twayblade Listera cordata
hemlock waterparsnip Sium suave
hoary tansyaster Machaeranthera canescens
hooded coralroot Corallorhiza striata
hookedspur violet Viola adunca
horned pondweed Zannichellia palustris
Hornemann's willowherb Epilobium hornemannii
Howell's pussytoes Antennaria howellii
Illinois pondweed Potamogeton illinoensis
lanceleaf figwort Scrophularia lanceolata
largeleaf sandwort Moehringia macrophylla
leathery grapefern Botrychium multifidum
lesser wirelettuce Stephanomeria minor
liverleaf wintergreen Pyrola asarifolia
long-stolon sedge Carex inops
longleaf groundcherry Physalis longifolia
lowland rotala Rotala ramosior
Macoun's barley ×Elyhordeum macounii
manyflowered monkeyflower Mimulus floribundus
marsh skullcap Scutellaria galericulata
meadow deathcamas Zigadenus venenosus
Menzies' campion Silene menziesii
Menzies' fiddleneck Amsinckia menziesii
Mexican lovegrass Eragrostis mexicana
milkflower willowherb Epilobium lactiflorum
Modoc yellowcress Rorippa tenerrima
mountain tansymustard Descurainia incana
mountain tarweed Madia glomerata
muskflower Mimulus moschatus
narrowleaf bur-reed Sparganium angustifolium
narrowleaf goosefoot Chenopodium leptophyllum
narrowleaf minerslettuce Montia linearis
neckweed Veronica peregrina
needleleaf navarretia Navarretia intertexta
northern adderstongue Ophioglossum pusillum
northern hollyfern Polystichum lonchitis
northern sweetgrass Hierochloe hirta
oneflowered broomrape Orobanche uniflora
Oregon cliff fern Woodsia oregana
pale false mannagrass Torreyochloa pallida
pimpernel willowherb Epilobium anagallidifolium
pinesap Monotropa hypopitys
pinyon goosefoot Chenopodium atrovirens
pitseed goosefoot Chenopodium berlandieri
povertyweed Iva axillaris
pullup muhly Muhlenbergia filiformis
purple reedgrass Calamagrostis purpurascens
Pursh seepweed Suaeda calceoliformis
red baneberry Actaea rubra
redwool plantain Plantago eriopoda
resin birch Betula glandulosa
ribseed sandmat Chamaesyce glyptosperma
Richardson's pondweed Potamogeton richardsonii
Rocky Mountain woodsia Woodsia scopulina
rosy pussytoes Antennaria rosea
roundleaf sundew Drosera rotundifolia
sand spikerush Eleocharis montevidensis
scentbottle Platanthera dilatata
Scouler's popcornflower Plagiobothrys scouleri
seaside arrowgrass Triglochin maritima
shaggy fleabane Erigeron pumilus
shortseed waterwort Elatine brachysperma
sidebells wintergreen Orthilia secunda
silverscale saltbush Atriplex argentea
single delight Moneses uniflora
sleepy silene Silene antirrhina
slender bog orchid Platanthera stricta
slender phlox Microsteris gracilis
slender-spire orchid Piperia unalascensis
small pondweed Potamogeton pusillus
snowline wintergreen Pyrola minor
spearleaf stonecrop Sedum lanceolatum
spiny phlox Phlox hoodii
spotted fritillary Fritillaria atropurpurea
spotted water hemlock Cicuta maculata
spreading dogbane Apocynum androsaemifolium
spreading fleabane Erigeron divergens
starry false lily of the valley Maianthemum stellatum
stream orchid Epipactis gigantea
summer coralroot Corallorhiza maculata
sweetcicely Osmorhiza berteroi
tall annual willowherb Epilobium brachycarpum
tarragon Artemisia dracunculus
tasselflower brickellbush Brickellia grandiflora
threadleaf crowfoot Ranunculus trichophyllus
threenerve goldenrod Solidago velutina
tiny trumpet Collomia linearis
tower rockcress Arabis glabra
tumblegrass Schedonnardus paniculatus
turion duckweed Lemna turionifera
twinflower Linnaea borealis
Virginia pepperweed Lepidium virginicum
Virginia strawberry Fragaria virginiana
water minerslettuce Montia chamissoi
water mudwort Limosella aquatica
wavyleaf thistle Cirsium undulatum
western marsh cudweed Gnaphalium palustre
western rattlesnake plantain Goodyera oblongifolia
western tansymustard Descurainia pinnata
whitestem blazingstar Mentzelia albicaulis
willow dock Rumex salicifolius
witchgrass Panicum capillare
woodland draba Draba nemorosa
woodland pinedrops Pterospora andromedea
woodland strawberry Fragaria vesca
woolly sedge Carex pellita
Wright's cudweed Pseudognaphalium canescens
yellow avens Geum aleppicum
yellow water buttercup Ranunculus flabellaris

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
bride's feathersAruncus dioicus
Kentucky bluegrassPoa pratensis
white sagebrushArtemisia ludoviciana

Compared with California

The typical county is the median of the 58 California 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, Siskiyou County and California
Measure	Siskiyou County	Typical county	Statewide
Native species	603	333	1,108
Garden-ready natives	435	239	720
Tree	65	—	111
Shrub	70	—	140
Wildflower (forb)	322	—	559
Grass or grass-like	125	—	253
Vine	7	—	16
Fern	14	—	29

Neighboring counties

Counties that share a ZIP code with Siskiyou County.

Humboldt County, CA 345 garden-ready
Modoc County, CA 356 garden-ready
Shasta County, CA 391 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: Siskiyou County (county FIPS 06093), California. 603 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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