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USDA PLANTS Database — Plant Characteristics
USDA Natural Resources Conservation Service. This registry entry connects 736 plant records to 736 normalized source rows. It is primary fire evidence whose independent lineage can affect a fire classification. Evidence kind: hardiness reference; lineage: usda-plants-characteristics.
- Publisher
- USDA Natural Resources Conservation Service
- Region
- United States
- Evidence kind
- Hardiness reference
- Linked plants
- 736
- Normalized rows
- 736
Acquisition and license
- Source version
- API cache refreshed 2026-08-25; definitions from PLANTS Help Document 2022
- Retrieved
- 2026-08-25
- Upstream license
- License not stated on the API or PLANTS Help Document
- Derived rows
- CC BY 4.0
- SHA-256
f7f0ffd74bb9c0fe5be840bfb5c208644125b01d97dc30c678493abc124f8523
The Temperature, Minimum (°F) characteristic is an exact temperature, not a plant-zone range. FireApproved retains the measurement and maps it only to the containing 2023 PHZM half-zone for comparison.
Linked plant records (736)
| Plant | Source use |
|---|---|
| Aaron's beard | hardiness · 1 |
| Alaska cedar | hardiness · 1 |
| alderleaf mountain mahogany | hardiness · 1 |
| alfalfa | hardiness · 1 |
| Allegheny serviceberry | hardiness · 1 |
| aloe yucca | hardiness · 1 |
| alsike clover | hardiness · 1 |
| alternateleaf dogwood | hardiness · 1 |
| American basswood | hardiness · 1 |
| American basswood | hardiness · 1 |
| American beautyberry | hardiness · 1 |
| American beech | hardiness · 1 |
| American bittersweet | hardiness · 1 |
| American black elderberry | hardiness · 1 |
| American chestnut | hardiness · 1 |
| American cranberrybush | hardiness · 1 |
| American elm | hardiness · 1 |
| American hazelnut | hardiness · 1 |
| American holly | hardiness · 1 |
| American hornbeam | hardiness · 1 |
| American mountain ash | hardiness · 1 |
| American plum | hardiness · 1 |
| American pokeweed | hardiness · 1 |
| American red raspberry | hardiness · 1 |
| American sycamore | hardiness · 1 |
| American wisteria | hardiness · 1 |
| American witchhazel | hardiness · 1 |
| Amur honeysuckle | hardiness · 1 |
| antelope bitterbrush | hardiness · 1 |
| Apache plume | hardiness · 1 |
| apple | hardiness · 1 |
| Arabian coffee | hardiness · 1 |
| arborvitae | hardiness · 1 |
| Arizona cottontop | hardiness · 1 |
| Arizona fescue | hardiness · 1 |
| Arizona walnut | hardiness · 1 |
| Arizona walnut | hardiness · 1 |
| Atlantic white cedar | hardiness · 1 |
| Australian saltbush | hardiness · 1 |
| Austrian pine | hardiness · 1 |
| autumn olive | hardiness · 1 |
| bald cypress | hardiness · 1 |
| bald cypress | hardiness · 1 |
| balsam fir | hardiness · 1 |
| banana yucca | hardiness · 1 |
| Barbary fig | hardiness · 1 |
| basin wildrye | hardiness · 1 |
| beach sheoak | hardiness · 1 |
| beach strawberry | hardiness · 1 |
| beaked hazelnut | hardiness · 1 |
| bearded beggarticks | hardiness · 1 |
| beardless wildrye | hardiness · 1 |
| big blue lilyturf | hardiness · 1 |
| big sagebrush | hardiness · 1 |
| big sagebrush | hardiness · 1 |
| big trefoil | hardiness · 1 |
| bigleaf aster | hardiness · 1 |
| bigleaf maple | hardiness · 1 |
| bigtooth aspen | hardiness · 1 |
| bigtooth maple | hardiness · 1 |
| bird-of-paradise shrub | hardiness · 1 |
| bird's-foot trefoil | hardiness · 1 |
| Bishop pine | hardiness · 1 |
| bitter cherry | hardiness · 1 |
| bitternut hickory | hardiness · 1 |
| black ash | hardiness · 1 |
| black cherry | hardiness · 1 |
| black chokeberry | hardiness · 1 |
| black cottonwood | hardiness · 1 |
| black hawthorn | hardiness · 1 |
| black hawthorn | hardiness · 1 |
| black huckleberry | hardiness · 1 |
| black locust | hardiness · 1 |
| black maple | hardiness · 1 |
| black oak | hardiness · 1 |
| black spruce | hardiness · 1 |
| black walnut | hardiness · 1 |
| black willow | hardiness · 1 |
| blackeyed Susan | hardiness · 1 |
| blackeyed Susan | hardiness · 1 |
| blackgum | hardiness · 1 |
| blackhaw | hardiness · 1 |
| blackjack oak | hardiness · 1 |
| blackwood | hardiness · 1 |
| blanketflower | hardiness · 1 |
| blanketflower | hardiness · 1 |
| blue grama | hardiness · 1 |
| blue huckleberry | hardiness · 1 |
| blue mistflower | hardiness · 1 |
| blue mistflower | hardiness · 1 |
| blue oak | hardiness · 1 |
| blue spruce | hardiness · 1 |
| bluegreen saltbush | hardiness · 1 |
| bog blueberry | hardiness · 1 |
| bog Labrador tea | hardiness · 1 |
| bog laurel | hardiness · 1 |
| Boston ivy | hardiness · 1 |
| bouncingbet | hardiness · 1 |
| boxelder | hardiness · 1 |
| Brazilian peppertree | hardiness · 1 |
| bridalwreath spirea | hardiness · 1 |
| brittlebush | hardiness · 1 |
| broadleaf cattail | hardiness · 1 |
| broom snakeweed | hardiness · 1 |
| buckbean | hardiness · 1 |
| buffalograss | hardiness · 1 |
| buffelgrass | hardiness · 1 |
| bulbous canarygrass | hardiness · 1 |
| bulbous canarygrass | hardiness · 1 |
| bunchberry dogwood | hardiness · 1 |
| bur oak | hardiness · 1 |
| burningbush | hardiness · 1 |
| burrobush | hardiness · 1 |
| bursting-heart | hardiness · 1 |
| bush chinquapin | hardiness · 1 |
| bush penstemon | hardiness · 1 |
| bushy bluestem | hardiness · 1 |
| butterfly milkweed | hardiness · 1 |
| butternut | hardiness · 1 |
| cabbage palmetto | hardiness · 1 |
| cabbagebark tree | hardiness · 1 |
| California black oak | hardiness · 1 |
| California brome | hardiness · 1 |
| California buckeye | hardiness · 1 |
| California foothill pine | hardiness · 1 |
| California huckleberry | hardiness · 1 |
| California poppy | hardiness · 1 |
| California privet | hardiness · 1 |
| California red fir | hardiness · 1 |
| California sycamore | hardiness · 1 |
| California wax myrtle | hardiness · 1 |
| Callery pear | hardiness · 1 |
| Canada bluegrass | hardiness · 1 |
| Canada goldenrod | hardiness · 1 |
| Canada goldenrod | hardiness · 1 |
| Canadian serviceberry | hardiness · 1 |
| Canary Island pine | hardiness · 1 |
| cardinalflower | hardiness · 1 |
| Carolina buckthorn | hardiness · 1 |
| Carolina hemlock | hardiness · 1 |
| Carolina rose | hardiness · 1 |
| Carolina silverbell | hardiness · 1 |
| Cascara buckthorn | hardiness · 1 |
| cassava | hardiness · 1 |
| cat greenbrier | hardiness · 1 |
| catclaw acacia | hardiness · 1 |
| cattle saltbush | hardiness · 1 |
| cherrybark oak | hardiness · 1 |
| chestnut oak | hardiness · 1 |
| Chickasaw plum | hardiness · 1 |
| chicory | hardiness · 1 |
| Chinaberrytree | hardiness · 1 |
| Chinese chestnut | hardiness · 1 |
| Chinese elm | hardiness · 1 |
| Chinese fountaingrass | hardiness · 1 |
| Chinese holly | hardiness · 1 |
| Chinese juniper | hardiness · 1 |
| Chinese pear | hardiness · 1 |
| Chinese silvergrass | hardiness · 1 |
| chinquapin | hardiness · 1 |
| chinquapin oak | hardiness · 1 |
| chokecherry | hardiness · 1 |
| cliff fendlerbush | hardiness · 1 |
| climbing rose | hardiness · 1 |
| coastal doghobble | hardiness · 1 |
| coastal plain willow | hardiness · 1 |
| coastal sweetpepperbush | hardiness · 1 |
| coastal wattle | hardiness · 1 |
| cockspur hawthorn | hardiness · 1 |
| coconut palm | hardiness · 1 |
| colonial bentgrass | hardiness · 1 |
| Colorado blue columbine | hardiness · 1 |
| Colorado blue columbine | hardiness · 1 |
| Colorado four o'clock | hardiness · 1 |
| Columbian monkshood | hardiness · 1 |
| common bamboo | hardiness · 1 |
| common barley | hardiness · 1 |
| common beargrass | hardiness · 1 |
| common bugle | hardiness · 1 |
| common buttonbush | hardiness · 1 |
| common hackberry | hardiness · 1 |
| common hoptree | hardiness · 1 |
| common juniper | hardiness · 1 |
| common lilac | hardiness · 1 |
| common ninebark | hardiness · 1 |
| common oat | hardiness · 1 |
| common pear | hardiness · 1 |
| common periwinkle | hardiness · 1 |
| common persimmon | hardiness · 1 |
| common plantain | hardiness · 1 |
| common reed | hardiness · 1 |
| common rush | hardiness · 1 |
| common serviceberry | hardiness · 1 |
| common snowberry | hardiness · 1 |
| common sotol | hardiness · 1 |
| common sunflower | hardiness · 1 |
| common sweetleaf | hardiness · 1 |
| common velvetgrass | hardiness · 1 |
| common wheat | hardiness · 1 |
| common winterberry | hardiness · 1 |
| common yarrow | hardiness · 1 |
| confederate jasmine | hardiness · 1 |
| copperbush | hardiness · 1 |
| coralbells | hardiness · 1 |
| coralberry | hardiness · 1 |
| Cornelian cherry | hardiness · 1 |
| cotoneaster | hardiness · 1 |
| cotoneaster | hardiness · 1 |
| Coulter pine | hardiness · 1 |
| coyotebrush | hardiness · 1 |
| cranberry cotoneaster | hardiness · 1 |
| crapemyrtle | hardiness · 1 |
| creeping barberry | hardiness · 1 |
| creeping bentgrass | hardiness · 1 |
| creeping buttercup | hardiness · 1 |
| creeping juniper | hardiness · 1 |
| crested wheatgrass | hardiness · 1 |
| crimson fountaingrass | hardiness · 1 |
| crimsoneyed rosemallow | hardiness · 1 |
| crownvetch | hardiness · 1 |
| cucumber tree | hardiness · 1 |
| cup plant | hardiness · 1 |
| custard apple | hardiness · 1 |
| dahoon | hardiness · 1 |
| dawn redwood | hardiness · 1 |
| daylily | hardiness · 1 |
| deerberry | hardiness · 1 |
| deergrass | hardiness · 1 |
| dense blazing star | hardiness · 1 |
| Deodar cedar | hardiness · 1 |
| desert bitterbrush | hardiness · 1 |
| desert ironwood | hardiness · 1 |
| desert wheatgrass | hardiness · 1 |
| desert willow | hardiness · 1 |
| desert yellow fleabane | hardiness · 1 |
| desertbroom | hardiness · 1 |
| devil's darning needles | hardiness · 1 |
| devil's walkingstick | hardiness · 1 |
| dotted blazing star | hardiness · 1 |
| Douglas-fir | hardiness · 1 |
| dwarf azalea | hardiness · 1 |
| dwarf huckleberry | hardiness · 1 |
| dwarf palmetto | hardiness · 1 |
| dwarf witchalder | hardiness · 1 |
| eastern baccharis | hardiness · 1 |
| eastern cottonwood | hardiness · 1 |
| eastern hemlock | hardiness · 1 |
| eastern purple coneflower | hardiness · 1 |
| eastern redbud | hardiness · 1 |
| eastern redcedar | hardiness · 1 |
| eastern teaberry | hardiness · 1 |
| eastern white pine | hardiness · 1 |
| eggplant | hardiness · 1 |
| Engelmann's daisy | hardiness · 1 |
| English ivy | hardiness · 1 |
| English walnut | hardiness · 1 |
| English yew | hardiness · 1 |
| European alder | hardiness · 1 |
| European bird cherry | hardiness · 1 |
| European crab apple | hardiness · 1 |
| European cranberrybush | hardiness · 1 |
| European larch | hardiness · 1 |
| European lily of the valley | hardiness · 1 |
| European mountain ash | hardiness · 1 |
| European privet | hardiness · 1 |
| European white birch | hardiness · 1 |
| European white birch | hardiness · 1 |
| evergreen candytuft | hardiness · 1 |
| false indigo bush | hardiness · 1 |
| farkleberry | hardiness · 1 |
| fetterbush lyonia | hardiness · 1 |
| firecracker penstemon | hardiness · 1 |
| Florida hopbush | hardiness · 1 |
| Florida maple | hardiness · 1 |
| Florida nutmeg | hardiness · 1 |
| flowering dogwood | hardiness · 1 |
| forage kochia | hardiness · 1 |
| fourwing saltbush | hardiness · 1 |
| fox sedge | hardiness · 1 |
| Franklin tree | hardiness · 1 |
| Fraser fir | hardiness · 1 |
| French hydrangea | hardiness · 1 |
| galleta grass | hardiness · 1 |
| Gambel oak | hardiness · 1 |
| Gardner's saltbush | hardiness · 1 |
| Gardner's saltbush | hardiness · 1 |
| giant cane | hardiness · 1 |
| giant reed | hardiness · 1 |
| giant sequoia | hardiness · 1 |
| glossy buckthorn | hardiness · 1 |
| glossy buckthorn | hardiness · 1 |
| golden bamboo | hardiness · 1 |
| golden currant | hardiness · 1 |
| golden currant | hardiness · 1 |
| golden tickseed | hardiness · 1 |
| goldenrain tree | hardiness · 1 |
| grand eucalyptus | hardiness · 1 |
| grand fir | hardiness · 1 |
| gray alder | hardiness · 1 |
| gray birch | hardiness · 1 |
| gray dogwood | hardiness · 1 |
| gray goldenrod | hardiness · 1 |
| gray sheoak | hardiness · 1 |
| great coneflower | hardiness · 1 |
| great laurel | hardiness · 1 |
| green ash | hardiness · 1 |
| green bulrush | hardiness · 1 |
| green hawthorn | hardiness · 1 |
| green needlegrass | hardiness · 1 |
| green sprangletop | hardiness · 1 |
| Greene's mountain ash | hardiness · 1 |
| greenleaf manzanita | hardiness · 1 |
| greenleaf manzanita | hardiness · 1 |
| guava | hardiness · 1 |
| guineagrass | hardiness · 1 |
| hairawn muhly | hardiness · 1 |
| hard fescue | hardiness · 1 |
| hard fescue | hardiness · 1 |
| hazel alder | hardiness · 1 |
| highbush blueberry | hardiness · 1 |
| highland doghobble | hardiness · 1 |
| holly osmanthus | hardiness · 1 |
| hollyleaf cherry | hardiness · 1 |
| hollyleaved barberry | hardiness · 1 |
| honeycup | hardiness · 1 |
| honeylocust | hardiness · 1 |
| hophornbeam | hardiness · 1 |
| horseflyweed | hardiness · 1 |
| huckleberry oak | hardiness · 1 |
| Idaho fescue | hardiness · 1 |
| incense cedar | hardiness · 1 |
| Indian plum | hardiness · 1 |
| Indian ricegrass | hardiness · 1 |
| Indian woodoats | hardiness · 1 |
| Indiangrass | hardiness · 1 |
| Indianhemp | hardiness · 1 |
| inkberry | hardiness · 1 |
| intermediate wheatgrass | hardiness · 1 |
| intermediate wheatgrass | hardiness · 1 |
| intermediate wheatgrass | hardiness · 1 |
| interrupted fern | hardiness · 1 |
| island gooseberry | hardiness · 1 |
| Jack in the pulpit | hardiness · 1 |
| jack pine | hardiness · 1 |
| Japanese barberry | hardiness · 1 |
| Japanese black pine | hardiness · 1 |
| Japanese cedar | hardiness · 1 |
| Japanese cheesewood | hardiness · 1 |
| Japanese flowering crab apple | hardiness · 1 |
| Japanese holly | hardiness · 1 |
| Japanese honeysuckle | hardiness · 1 |
| Japanese larch | hardiness · 1 |
| Japanese meadowsweet | hardiness · 1 |
| Japanese pachysandra | hardiness · 1 |
| Japanese pieris | hardiness · 1 |
| Japanese privet | hardiness · 1 |
| Japanese yew | hardiness · 1 |
| Japanese zelkova | hardiness · 1 |
| Java plum | hardiness · 1 |
| Jeffrey pine | hardiness · 1 |
| jewelweed | hardiness · 1 |
| Johnsongrass | hardiness · 1 |
| jojoba | hardiness · 1 |
| Kentucky bluegrass | hardiness · 1 |
| Kentucky coffeetree | hardiness · 1 |
| Kentucky yellowwood | hardiness · 1 |
| kinnikinnick | hardiness · 1 |
| Korean lawngrass | hardiness · 1 |
| Kura clover | hardiness · 1 |
| lanceleaf greenbrier | hardiness · 1 |
| lanceleaf tickseed | hardiness · 1 |
| laurel greenbrier | hardiness · 1 |
| laurel oak | hardiness · 1 |
| leatherleaf | hardiness · 1 |
| Lehmann lovegrass | hardiness · 1 |
| Lewis flax | hardiness · 1 |
| limber pine | hardiness · 1 |
| little bluestem | hardiness · 1 |
| littleleaf linden | hardiness · 1 |
| littleleaf mock orange | hardiness · 1 |
| littleleaf pussytoes | hardiness · 1 |
| littleleaf sumac | hardiness · 1 |
| littleseed ricegrass | hardiness · 1 |
| live oak | hardiness · 1 |
| loblolly bay | hardiness · 1 |
| loblolly pine | hardiness · 1 |
| Lombardy poplar | hardiness · 1 |
| longhair sedge | hardiness · 1 |
| longleaf pine | hardiness · 1 |
| lowbush blueberry | hardiness · 1 |
| maidenhair tree | hardiness · 1 |
| mallow ninebark | hardiness · 1 |
| mammee apple | hardiness · 1 |
| mango | hardiness · 1 |
| mapleleaf viburnum | hardiness · 1 |
| Maule's quince | hardiness · 1 |
| may hawthorn | hardiness · 1 |
| meadow foxtail | hardiness · 1 |
| memorial rose | hardiness · 1 |
| mescal bean | hardiness · 1 |
| miner's lettuce | hardiness · 1 |
| Missouri goldenrod | hardiness · 1 |
| mockernut hickory | hardiness · 1 |
| Monterey pine | hardiness · 1 |
| mormon tea | hardiness · 1 |
| moss phlox | hardiness · 1 |
| mountain azalea | hardiness · 1 |
| mountain hemlock | hardiness · 1 |
| mountain laurel | hardiness · 1 |
| mountain magnolia | hardiness · 1 |
| mountain maple | hardiness · 1 |
| mugo pine | hardiness · 1 |
| Munro's globemallow | hardiness · 1 |
| muscadine | hardiness · 1 |
| muttongrass | hardiness · 1 |
| Nanking cherry | hardiness · 1 |
| nannyberry | hardiness · 1 |
| narrowleaf cottonwood | hardiness · 1 |
| narrowleaf evening primrose | hardiness · 1 |
| netleaf hackberry | hardiness · 1 |
| New Jersey tea | hardiness · 1 |
| New York ironweed | hardiness · 1 |
| Norfolk Island pine | hardiness · 1 |
| northern bedstraw | hardiness · 1 |
| northern bush honeysuckle | hardiness · 1 |
| northern catalpa | hardiness · 1 |
| northern mountain ash | hardiness · 1 |
| northern red oak | hardiness · 1 |
| northern spicebush | hardiness · 1 |
| Norway maple | hardiness · 1 |
| Norway spruce | hardiness · 1 |
| Nuttall oak | hardiness · 1 |
| o-zumi | hardiness · 1 |
| oakleaf hydrangea | hardiness · 1 |
| oceanspray | hardiness · 1 |
| ocotillo | hardiness · 1 |
| Ohio buckeye | hardiness · 1 |
| old man's whiskers | hardiness · 1 |
| oleander | hardiness · 1 |
| oneseed hawthorn | hardiness · 1 |
| orchardgrass | hardiness · 1 |
| Oregon ash | hardiness · 1 |
| Oregon crab apple | hardiness · 1 |
| Oregon white oak | hardiness · 1 |
| Oriental arborvitae | hardiness · 1 |
| Oriental bittersweet | hardiness · 1 |
| Osage-orange | hardiness · 1 |
| overcup oak | hardiness · 1 |
| Pacific bleeding heart | hardiness · 1 |
| Pacific madrone | hardiness · 1 |
| Pacific ninebark | hardiness · 1 |
| Pacific rhododendron | hardiness · 1 |
| Pacific silver fir | hardiness · 1 |
| Pacific yew | hardiness · 1 |
| painted buckeye | hardiness · 1 |
| Palmer's penstemon | hardiness · 1 |
| papaya | hardiness · 1 |
| paper birch | hardiness · 1 |
| partridge pea | hardiness · 1 |
| pawpaw | hardiness · 1 |
| peachleaf willow | hardiness · 1 |
| pecan | hardiness · 1 |
| Peking cotoneaster | hardiness · 1 |
| peppervine | hardiness · 1 |
| peppervine | hardiness · 1 |
| perennial pea | hardiness · 1 |
| perennial ryegrass | hardiness · 1 |
| perennial veldtgrass | hardiness · 1 |
| pigeonpea | hardiness · 1 |
| pignut hickory | hardiness · 1 |
| pin cherry | hardiness · 1 |
| pin oak | hardiness · 1 |
| pineapple | hardiness · 1 |
| pineland threeawn | hardiness · 1 |
| pinemat manzanita | hardiness · 1 |
| pink azalea | hardiness · 1 |
| pitch pine | hardiness · 1 |
| Piute cypress | hardiness · 1 |
| Piute cypress | hardiness · 1 |
| plains pricklypear | hardiness · 1 |
| pointleaf manzanita | hardiness · 1 |
| pomegranate | hardiness · 1 |
| pond pine | hardiness · 1 |
| ponderosa pine | hardiness · 1 |
| Port Orford cedar | hardiness · 1 |
| Possum-haw holly | hardiness · 1 |
| post oak | hardiness · 1 |
| poverty rush | hardiness · 1 |
| prairie cordgrass | hardiness · 1 |
| prairie crab apple | hardiness · 1 |
| prairie Junegrass | hardiness · 1 |
| prairie sagewort | hardiness · 1 |
| prickly currant | hardiness · 1 |
| pride of Ohio | hardiness · 1 |
| princesstree | hardiness · 1 |
| prostrate ceanothus | hardiness · 1 |
| pumpkin ash | hardiness · 1 |
| purple poppymallow | hardiness · 1 |
| purpleosier willow | hardiness · 1 |
| pussy willow | hardiness · 1 |
| quaking aspen | hardiness · 1 |
| ravennagrass | hardiness · 1 |
| red alder | hardiness · 1 |
| red brome | hardiness · 1 |
| red buckeye | hardiness · 1 |
| red chokeberry | hardiness · 1 |
| red clover | hardiness · 1 |
| red currant | hardiness · 1 |
| red elderberry | hardiness · 1 |
| red fescue | hardiness · 1 |
| red huckleberry | hardiness · 1 |
| red maple | hardiness · 1 |
| red mulberry | hardiness · 1 |
| red pine | hardiness · 1 |
| red spruce | hardiness · 1 |
| redbay | hardiness · 1 |
| redflower currant | hardiness · 1 |
| redstem ceanothus | hardiness · 1 |
| redtop | hardiness · 1 |
| redwood | hardiness · 1 |
| reed canarygrass | hardiness · 1 |
| rescuegrass | hardiness · 1 |
| rhodora | hardiness · 1 |
| river birch | hardiness · 1 |
| river redgum | hardiness · 1 |
| river sheoak | hardiness · 1 |
| rockspirea | hardiness · 1 |
| rockspray cotoneaster | hardiness · 1 |
| Rocky Mountain beeplant | hardiness · 1 |
| Rocky Mountain iris | hardiness · 1 |
| Rocky Mountain juniper | hardiness · 1 |
| Rocky Mountain maple | hardiness · 1 |
| Rocky Mountain penstemon | hardiness · 1 |
| rose spirea | hardiness · 1 |
| rough bentgrass | hardiness · 1 |
| roughleaf dogwood | hardiness · 1 |
| roundleaf greenbrier | hardiness · 1 |
| royal poinciana | hardiness · 1 |
| rugosa rose | hardiness · 1 |
| russet buffaloberry | hardiness · 1 |
| Russian olive | hardiness · 1 |
| Russian wildrye | hardiness · 1 |
| sacahuista | hardiness · 1 |
| sacred bamboo | hardiness · 1 |
| sagebrush mariposa lily | hardiness · 1 |
| salal | hardiness · 1 |
| sand dropseed | hardiness · 1 |
| sand pine | hardiness · 1 |
| Sandberg bluegrass | hardiness · 1 |
| Sandberg bluegrass | hardiness · 1 |
| sandcherry | hardiness · 1 |
| Saskatoon serviceberry | hardiness · 1 |
| sassafras | hardiness · 1 |
| saw palmetto | hardiness · 1 |
| sawtooth oak | hardiness · 1 |
| scarlet firethorn | hardiness · 1 |
| scarlet oak | hardiness · 1 |
| Scotch broom | hardiness · 1 |
| Scots pine | hardiness · 1 |
| Scouler's willow | hardiness · 1 |
| seaside goldenrod | hardiness · 1 |
| shadscale saltbush | hardiness · 1 |
| shagbark hickory | hardiness · 1 |
| sheep fescue | hardiness · 1 |
| shellbark hickory | hardiness · 1 |
| shingle oak | hardiness · 1 |
| shortleaf pine | hardiness · 1 |
| shrub lespedeza | hardiness · 1 |
| shrubby St. Johnswort | hardiness · 1 |
| Shumard's oak | hardiness · 1 |
| Siberian elm | hardiness · 1 |
| Siberian peashrub | hardiness · 1 |
| Siberian wheatgrass | hardiness · 1 |
| sickle saltbush | hardiness · 1 |
| Sierra larkspur | hardiness · 1 |
| silkoak | hardiness · 1 |
| silktree | hardiness · 1 |
| silky dogwood | hardiness · 1 |
| silver bluestem | hardiness · 1 |
| silver buffaloberry | hardiness · 1 |
| silver maple | hardiness · 1 |
| silverberry | hardiness · 1 |
| silvery lupine | hardiness · 1 |
| singleleaf pinyon | hardiness · 1 |
| skunkbush sumac | hardiness · 1 |
| slash pine | hardiness · 1 |
| slender pride of Rochester | hardiness · 1 |
| slippery elm | hardiness · 1 |
| small burnet | hardiness · 1 |
| small-leaf arrowwood | hardiness · 1 |
| smooth azalea | hardiness · 1 |
| smooth sumac | hardiness · 1 |
| soaptree yucca | hardiness · 1 |
| soapweed yucca | hardiness · 1 |
| soursop | hardiness · 1 |
| sourwood | hardiness · 1 |
| southern catalpa | hardiness · 1 |
| southern magnolia | hardiness · 1 |
| southern red oak | hardiness · 1 |
| southern sugar maple | hardiness · 1 |
| Spanish moss | hardiness · 1 |
| speckled alder | hardiness · 1 |
| spike muhly | hardiness · 1 |
| spiny hackberry | hardiness · 1 |
| splitbeard bluestem | hardiness · 1 |
| spruce pine | hardiness · 1 |
| squashberry | hardiness · 1 |
| squirreltail | hardiness · 1 |
| staghorn sumac | hardiness · 1 |
| star magnolia | hardiness · 1 |
| strawberry clover | hardiness · 1 |
| striped maple | hardiness · 1 |
| sugar apple | hardiness · 1 |
| sugar maple | hardiness · 1 |
| sugar pine | hardiness · 1 |
| sugar sumac | hardiness · 1 |
| sugarberry | hardiness · 1 |
| sugarcane | hardiness · 1 |
| sulphur-flower buckwheat | hardiness · 1 |
| swamp azalea | hardiness · 1 |
| swamp bay | hardiness · 1 |
| swamp chestnut oak | hardiness · 1 |
| swamp doghobble | hardiness · 1 |
| swamp milkweed | hardiness · 1 |
| swamp sunflower | hardiness · 1 |
| swamp titi | hardiness · 1 |
| swamp white oak | hardiness · 1 |
| swampmahogany | hardiness · 1 |
| sweet birch | hardiness · 1 |
| sweet fern | hardiness · 1 |
| sweet mock orange | hardiness · 1 |
| sweet orange | hardiness · 1 |
| sweetbay | hardiness · 1 |
| sweetbriar rose | hardiness · 1 |
| sweetgum | hardiness · 1 |
| switchcane | hardiness · 1 |
| switchgrass | hardiness · 1 |
| sycamore maple | hardiness · 1 |
| Sydney bluegum | hardiness · 1 |
| Table Mountain pine | hardiness · 1 |
| tall fescue | hardiness · 1 |
| tall fescue | hardiness · 1 |
| tall oatgrass | hardiness · 1 |
| tamarack | hardiness · 1 |
| tamarind | hardiness · 1 |
| tanglehead | hardiness · 1 |
| tapertip onion | hardiness · 1 |
| Tasmanian bluegum | hardiness · 1 |
| Tatarian honeysuckle | hardiness · 1 |
| thimbleberry | hardiness · 1 |
| thrift seapink | hardiness · 1 |
| timothy | hardiness · 1 |
| toringo crab | hardiness · 1 |
| tree of heaven | hardiness · 1 |
| trumpet creeper | hardiness · 1 |
| trumpet honeysuckle | hardiness · 1 |
| trumpetweed | hardiness · 1 |
| tufted evening primrose | hardiness · 1 |
| tufted hairgrass | hardiness · 1 |
| tufted hairgrass | hardiness · 1 |
| tuliptree | hardiness · 1 |
| turkey oak | hardiness · 1 |
| turkey tangle fogfruit | hardiness · 1 |
| two-wing silverbell | hardiness · 1 |
| twoneedle pinyon | hardiness · 1 |
| umbrella-tree | hardiness · 1 |
| upright prairie coneflower | hardiness · 1 |
| Uruguayan pampas grass | hardiness · 1 |
| Utah juniper | hardiness · 1 |
| valley oak | hardiness · 1 |
| villous lilac | hardiness · 1 |
| vine maple | hardiness · 1 |
| Virginia bluebells | hardiness · 1 |
| Virginia creeper | hardiness · 1 |
| Virginia pine | hardiness · 1 |
| Virginia rose | hardiness · 1 |
| Virginia sweetspire | hardiness · 1 |
| wartleaf ceanothus | hardiness · 1 |
| Washington hawthorn | hardiness · 1 |
| water birch | hardiness · 1 |
| water oak | hardiness · 1 |
| water tupelo | hardiness · 1 |
| wax myrtle | hardiness · 1 |
| wax myrtle | hardiness · 1 |
| wayfaringtree | hardiness · 1 |
| weeping forsythia | hardiness · 1 |
| weeping lovegrass | hardiness · 1 |
| western azalea | hardiness · 1 |
| western columbine | hardiness · 1 |
| western hemlock | hardiness · 1 |
| western juniper | hardiness · 1 |
| western juniper | hardiness · 1 |
| western larch | hardiness · 1 |
| western pearly everlasting | hardiness · 1 |
| western redcedar | hardiness · 1 |
| western wheatgrass | hardiness · 1 |
| western white pine | hardiness · 1 |
| western yarrow | hardiness · 1 |
| Whipple's penstemon | hardiness · 1 |
| white alder | hardiness · 1 |
| white ash | hardiness · 1 |
| white clover | hardiness · 1 |
| white fir | hardiness · 1 |
| white fringetree | hardiness · 1 |
| white meadowsweet | hardiness · 1 |
| white mulberry | hardiness · 1 |
| white oak | hardiness · 1 |
| white poplar | hardiness · 1 |
| white sagebrush | hardiness · 1 |
| white spirea | hardiness · 1 |
| white spruce | hardiness · 1 |
| white willow | hardiness · 1 |
| whitebark pine | hardiness · 1 |
| whitegrass | hardiness · 1 |
| wild bergamot | hardiness · 1 |
| wild blue phlox | hardiness · 1 |
| Wild Mock Orange | hardiness · 1 |
| willow oak | hardiness · 1 |
| winged elm | hardiness · 1 |
| winter creeper | hardiness · 1 |
| winterfat | hardiness · 1 |
| wintergreen barberry | hardiness · 1 |
| Woods's rose | hardiness · 1 |
| woolgrass | hardiness · 1 |
| wreath goldenrod | hardiness · 1 |
| Wright's silktassel | hardiness · 1 |
| wrinkleleaf goldenrod | hardiness · 1 |
| yaupon | hardiness · 1 |
| yellow birch | hardiness · 1 |
| yellow buckeye | hardiness · 1 |
| yellow bush lupine | hardiness · 1 |
| yellow passionflower | hardiness · 1 |
| yellow rabbitbrush | hardiness · 1 |
| yellow trumpetbush | hardiness · 1 |
| yellow willow | hardiness · 1 |
| yew plum pine | hardiness · 1 |