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USDA PLANTS Database — Plant Characteristics
USDA Natural Resources Conservation Service. This registry entry connects 734 plant records to 734 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
- 734
- Normalized rows
- 734
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 (734)
| Plant | Source use |
|---|---|
| 'Fine Line® Improved' buckthorn | hardiness · 1 |
| Abies amabilis | hardiness · 1 |
| Acacia cyclops | hardiness · 1 |
| Ageratum | hardiness · 1 |
| Agrostis capillaris | hardiness · 1 |
| Agrostis gigantea | hardiness · 1 |
| Agrostis scabra | hardiness · 1 |
| Ajuga | hardiness · 1 |
| Alfalfa | hardiness · 1 |
| Allegheny serviceberry | hardiness · 1 |
| Allscale or desert saltbush | hardiness · 1 |
| Ambrosia dumosa | hardiness · 1 |
| American beautyberry | hardiness · 1 |
| American beech | hardiness · 1 |
| American chestnut | hardiness · 1 |
| American elm | hardiness · 1 |
| American hazelnut | hardiness · 1 |
| American holly | hardiness · 1 |
| American mountain-ash | hardiness · 1 |
| American plum | hardiness · 1 |
| American sweetgum | hardiness · 1 |
| American wisteria | hardiness · 1 |
| Amur honeysuckle | hardiness · 1 |
| Ananas comosus | hardiness · 1 |
| Andira inermis | hardiness · 1 |
| Annona muricata | hardiness · 1 |
| Annona reticulata | hardiness · 1 |
| Annona squamosa | hardiness · 1 |
| Apache Plume | hardiness · 1 |
| Apple | hardiness · 1 |
| Arborvitae | hardiness · 1 |
| Arctostaphylos parryana | hardiness · 1 |
| Arctostaphylos pungens | hardiness · 1 |
| Arizona cypress | hardiness · 1 |
| Arizona fescue | hardiness · 1 |
| Arizona walnut | hardiness · 1 |
| Arrowwood viburnum | hardiness · 1 |
| Austrian pine | hardiness · 1 |
| Autumn olive | hardiness · 1 |
| Avena sativa | hardiness · 1 |
| Axillary Goldenrod | hardiness · 1 |
| Baldcypress | hardiness · 1 |
| Balsam fir | hardiness · 1 |
| Bamboo | hardiness · 1 |
| Bamboo Vine | hardiness · 1 |
| Bambú japonés | hardiness · 1 |
| Banana yucca | hardiness · 1 |
| Barley | hardiness · 1 |
| Basswood | hardiness · 1 |
| Bay | hardiness · 1 |
| Beaked hazelnut | hardiness · 1 |
| Bear Grass | hardiness · 1 |
| Beargrass | hardiness · 1 |
| Bentgrass, creeping | hardiness · 1 |
| Berry Saltbush | hardiness · 1 |
| Betula platyphylla | hardiness · 1 |
| Big Blue Liriope | hardiness · 1 |
| Big bluegrass | hardiness · 1 |
| Big trefoil | hardiness · 1 |
| Bigleaf maple | hardiness · 1 |
| Bigtooth maple | hardiness · 1 |
| Birdfoot Trefoil | hardiness · 1 |
| Bitter Cherry | hardiness · 1 |
| Bitterbrush | hardiness · 1 |
| Bitternut hickory | hardiness · 1 |
| Bittersweet | hardiness · 1 |
| Bittersweet | hardiness · 1 |
| Black ash | hardiness · 1 |
| Black birch | hardiness · 1 |
| Black chokeberry | hardiness · 1 |
| Black gum | hardiness · 1 |
| Black huckleberry | hardiness · 1 |
| Black maple | hardiness · 1 |
| Black oak | hardiness · 1 |
| Black walnut | hardiness · 1 |
| Black willow | hardiness · 1 |
| Black-eyed Susan | hardiness · 1 |
| Blackhaw viburnum | hardiness · 1 |
| Blackjack oak | hardiness · 1 |
| Blackwood | hardiness · 1 |
| Blanket Flower | hardiness · 1 |
| Blanket Flower | hardiness · 1 |
| Blazing star | hardiness · 1 |
| Blue fescue | hardiness · 1 |
| Blue Grama | hardiness · 1 |
| Blue Gum | hardiness · 1 |
| Blue huckleberry | hardiness · 1 |
| Blue phlox | hardiness · 1 |
| Bog Labrador Tea | hardiness · 1 |
| Bog laurel | hardiness · 1 |
| Boston ivy | hardiness · 1 |
| Bothriochloa saccharoides | hardiness · 1 |
| Bottlebrush sedge | hardiness · 1 |
| Bouncing Bett | hardiness · 1 |
| Boxelder | hardiness · 1 |
| Brazilian peppertree | hardiness · 1 |
| Bridalwreath spirea | hardiness · 1 |
| Brittlebush | hardiness · 1 |
| Broadleaf plantain | hardiness · 1 |
| Brome, Mountain/California | hardiness · 1 |
| Buckvine | hardiness · 1 |
| Buffalograss | hardiness · 1 |
| Bulbous canary-grass | hardiness · 1 |
| Bunchberry | hardiness · 1 |
| Bur oak | hardiness · 1 |
| Burford Chinese holly | hardiness · 1 |
| Bush-honeysuckle | hardiness · 1 |
| Bushy bluestem | hardiness · 1 |
| Buttercup, creeping | hardiness · 1 |
| Butternut | hardiness · 1 |
| Buttonbush | hardiness · 1 |
| Cajanus cajan | hardiness · 1 |
| California buckeye | hardiness · 1 |
| California Poppy | hardiness · 1 |
| California privet | hardiness · 1 |
| Callery pear | hardiness · 1 |
| Canada Bluegrass | hardiness · 1 |
| Canada Goldenrod | hardiness · 1 |
| Canada serviceberry | hardiness · 1 |
| Canadian hemlock | hardiness · 1 |
| Candytuft | hardiness · 1 |
| Cardinal flower | hardiness · 1 |
| Carica papaya | hardiness · 1 |
| Carolina buckthorn | hardiness · 1 |
| Carolina hemlock | hardiness · 1 |
| Carolina Rose | hardiness · 1 |
| Carolina Safire Arizona cypress | hardiness · 1 |
| Carolina silverbell | hardiness · 1 |
| Carolina willow | hardiness · 1 |
| Cascara | hardiness · 1 |
| Castlevalley saltbush | hardiness · 1 |
| Casuarina equisetifolia | hardiness · 1 |
| Casuarina glauca | hardiness · 1 |
| Cat Greenbriar | hardiness · 1 |
| Catalina cherry | hardiness · 1 |
| Catclaw acacia | hardiness · 1 |
| Celtis ehrenbergiana | hardiness · 1 |
| Cenchrus ciliaris | hardiness · 1 |
| Chasmanthium latifolium | hardiness · 1 |
| Cherrybark oak | hardiness · 1 |
| Chestnut oak | hardiness · 1 |
| Chickasaw plum | hardiness · 1 |
| Chicory | hardiness · 1 |
| Chinaberry | hardiness · 1 |
| Chinese chestnut | hardiness · 1 |
| Chinese juniper | hardiness · 1 |
| Chinquapin | hardiness · 1 |
| Chinquapin oak | hardiness · 1 |
| Chinquapin, bush | hardiness · 1 |
| Chokecherry | hardiness · 1 |
| Citrus aurantium | hardiness · 1 |
| cliff fendlerbush | hardiness · 1 |
| Climbing Rose | hardiness · 1 |
| Clove-scented Currant | hardiness · 1 |
| Coast azalea | hardiness · 1 |
| Coast leucothoe | hardiness · 1 |
| Coast redwood | hardiness · 1 |
| Cockspur hawthorn | hardiness · 1 |
| Cocos nucifera | hardiness · 1 |
| Coffea arabica | hardiness · 1 |
| Colorado blue columbine | hardiness · 1 |
| Colorado spruce | hardiness · 1 |
| Columbia Hawthorne | hardiness · 1 |
| Columbian monkshood | hardiness · 1 |
| Columbine, western or crimson | hardiness · 1 |
| Common Goldenrod | hardiness · 1 |
| Common hackberry | hardiness · 1 |
| Common juniper | hardiness · 1 |
| Common lilac | hardiness · 1 |
| Common privit | hardiness · 1 |
| Common sunflower | hardiness · 1 |
| Common witchhazel | hardiness · 1 |
| Common yarrow | hardiness · 1 |
| Compact American cranberrybush viburnum | hardiness · 1 |
| Confederate jasmine | hardiness · 1 |
| Copperbush | hardiness · 1 |
| Coral bells | hardiness · 1 |
| Cord Grass | hardiness · 1 |
| Corneliancherry dogwood | hardiness · 1 |
| Cotoneaster | hardiness · 1 |
| Cotoneaster, Peking | hardiness · 1 |
| Cottonwood | hardiness · 1 |
| Coulter pine | hardiness · 1 |
| Crabapple | hardiness · 1 |
| Cranberry cotoneaster | hardiness · 1 |
| Cranberry, High-bush* | hardiness · 1 |
| Crape myrtle | hardiness · 1 |
| Creeping holly | hardiness · 1 |
| Creeping juniper | hardiness · 1 |
| Creeping phlox | hardiness · 1 |
| Crested Wheatgrass | hardiness · 1 |
| Crested Wheatgrass | hardiness · 1 |
| Crown vetch | hardiness · 1 |
| Cucumber magnolia | hardiness · 1 |
| Cup Plant | hardiness · 1 |
| Currant | hardiness · 1 |
| Currant, Prickly | hardiness · 1 |
| Dahoon holly | hardiness · 1 |
| Daisy, Engelmann | hardiness · 1 |
| Dawn redwood | hardiness · 1 |
| Daylily | hardiness · 1 |
| Deerberry | hardiness · 1 |
| Deergrass | hardiness · 1 |
| Deodara cedar | hardiness · 1 |
| Desert broom | hardiness · 1 |
| Desert Four-o'clock | hardiness · 1 |
| Desert spoon | hardiness · 1 |
| Desert yellow fleabane | hardiness · 1 |
| Devil's walkingstick | hardiness · 1 |
| Digitaria californica | hardiness · 1 |
| Dogwood, Roughleaf | hardiness · 1 |
| Dotted Gay Feather | hardiness · 1 |
| Douglas fir | hardiness · 1 |
| Douglas Hawthorne | hardiness · 1 |
| Downy serviceberry | hardiness · 1 |
| Drooping leucothoe | hardiness · 1 |
| Dwarf Blue Arctic Willow | hardiness · 1 |
| Dwarf fothergilla | hardiness · 1 |
| Dwarf huckleberry | hardiness · 1 |
| Dwarf Serviceberry | hardiness · 1 |
| Eastern red cedar | hardiness · 1 |
| Eastern redbud | hardiness · 1 |
| Eggplant | hardiness · 1 |
| Elderberry | hardiness · 1 |
| Empresstree | hardiness · 1 |
| English ivy | hardiness · 1 |
| English walnut | hardiness · 1 |
| English yew | hardiness · 1 |
| Eragrostis lehmanniana | hardiness · 1 |
| Espadaña | hardiness · 1 |
| Esperanza, Yellow Bells | hardiness · 1 |
| Espino albar | hardiness · 1 |
| Eucalyptus grandis | hardiness · 1 |
| Eucalyptus robusta | hardiness · 1 |
| Eucalyptus saligna | hardiness · 1 |
| European alder | hardiness · 1 |
| European cranberry highbush viburnum | hardiness · 1 |
| European larch | hardiness · 1 |
| European mountain-ash | hardiness · 1 |
| European white birch | hardiness · 1 |
| Evergreen current | hardiness · 1 |
| Falcata saltbush | hardiness · 1 |
| Fall firebush | hardiness · 1 |
| Fescue, Chewings | hardiness · 1 |
| Fescue, sheep | hardiness · 1 |
| Fescue, Tall | hardiness · 1 |
| Fetterbush | hardiness · 1 |
| Firecracker Penstemon | hardiness · 1 |
| Firethorn | hardiness · 1 |
| Florida Maple | hardiness · 1 |
| Florida torreya | hardiness · 1 |
| Flowering dogwood | hardiness · 1 |
| Forage Kochia | hardiness · 1 |
| Fountain grass | hardiness · 1 |
| Four-wing Saltbush | hardiness · 1 |
| Fox sedge | hardiness · 1 |
| fragiferum | hardiness · 1 |
| Fragrant honeysuckle | hardiness · 1 |
| Frangula alnus | hardiness · 1 |
| Franklinia | hardiness · 1 |
| Fraser magnolia | hardiness · 1 |
| Frazer fir | hardiness · 1 |
| Fringed Sage | hardiness · 1 |
| Fringetree | hardiness · 1 |
| galleta grass | hardiness · 1 |
| Gambel Oak | hardiness · 1 |
| Gardner's Saltbush | hardiness · 1 |
| Giant cane | hardiness · 1 |
| Giant Coneflower | hardiness · 1 |
| Giant sequoia | hardiness · 1 |
| Ginkgo | hardiness · 1 |
| Glaucus/Sierra larkspur | hardiness · 1 |
| Golden Currant | hardiness · 1 |
| Golden Willow | hardiness · 1 |
| Goldenraintree | hardiness · 1 |
| Goldenrod | hardiness · 1 |
| Goldenrod | hardiness · 1 |
| Goldenrod* | hardiness · 1 |
| Gordonia | hardiness · 1 |
| Grand fir | hardiness · 1 |
| Gray dogwood | hardiness · 1 |
| Great Basin Wildrye | hardiness · 1 |
| Great Plains Yucca | hardiness · 1 |
| Green ash | hardiness · 1 |
| Green bulrush | hardiness · 1 |
| Green Rabbitbrush | hardiness · 1 |
| green sprangletop | hardiness · 1 |
| Greenbrier, Smilax, Catbrier | hardiness · 1 |
| Grey birch | hardiness · 1 |
| Groundsel tree | hardiness · 1 |
| Hardinggrass | hardiness · 1 |
| Hare's-foot clover | hardiness · 1 |
| Hemlock, mountain | hardiness · 1 |
| Hemp dogbane | hardiness · 1 |
| Heteropogon contortus | hardiness · 1 |
| Hierba penacho | hardiness · 1 |
| High bush blueberry | hardiness · 1 |
| Holcus lanatus | hardiness · 1 |
| Holly osmanthus | hardiness · 1 |
| Hooker's, tapper tipped onion | hardiness · 1 |
| Hophornbeam | hardiness · 1 |
| Hornbeam | hardiness · 1 |
| Huckleberry, Evergreen | hardiness · 1 |
| Huckleberry, Red | hardiness · 1 |
| Hydrangea | hardiness · 1 |
| Idaho Fescue | hardiness · 1 |
| Incense cedar | hardiness · 1 |
| Indian coralberry | hardiness · 1 |
| Indian Ricegrass | hardiness · 1 |
| Indian-plum | hardiness · 1 |
| Indiangrass | hardiness · 1 |
| Indigo-bush | hardiness · 1 |
| Inkberry | hardiness · 1 |
| Intermediate wheatgrass | hardiness · 1 |
| Interrupted fern | hardiness · 1 |
| Ironweed | hardiness · 1 |
| Jack-in-the-pulpit | hardiness · 1 |
| Jacksonbrier | hardiness · 1 |
| Japanese barberry | hardiness · 1 |
| Japanese black pine | hardiness · 1 |
| Japanese crabapple | hardiness · 1 |
| Japanese cryptomeria | hardiness · 1 |
| Japanese flowering-quince | hardiness · 1 |
| Japanese holly | hardiness · 1 |
| Japanese honeysuckle | hardiness · 1 |
| Japanese Larch | hardiness · 1 |
| Japanese pachysandra | hardiness · 1 |
| Japanese pieris | hardiness · 1 |
| Japanese pittosporum | hardiness · 1 |
| Japanese privit | hardiness · 1 |
| Japanese Spirea | hardiness · 1 |
| Japanese yew | hardiness · 1 |
| Japanese zelkova | hardiness · 1 |
| Jeffrey Pine | hardiness · 1 |
| Jewelweed | hardiness · 1 |
| Joe-pye-weed | hardiness · 1 |
| Johnsongrass | hardiness · 1 |
| Jojoba | hardiness · 1 |
| Juniper, western/Sierra | hardiness · 1 |
| Juniperus occidentalis | hardiness · 1 |
| Juniperus osteosperma | hardiness · 1 |
| Kentucky Bluegrass | hardiness · 1 |
| Kentucky coffee tree | hardiness · 1 |
| Kinnikinnick | hardiness · 1 |
| Lacebark elm | hardiness · 1 |
| Lance-leaved coreopsis | hardiness · 1 |
| Large-Leaved Aster | hardiness · 1 |
| Largetoothed aspen | hardiness · 1 |
| Late Lilac | hardiness · 1 |
| Laurel oak | hardiness · 1 |
| Leatherleaf | hardiness · 1 |
| Lespedeza bicolor | hardiness · 1 |
| Lily of the valley | hardiness · 1 |
| Lipia | hardiness · 1 |
| Little Bluestem | hardiness · 1 |
| Little-Leaf Mockorange | hardiness · 1 |
| Little-leaf Pussytoes | hardiness · 1 |
| Littleleaf linden | hardiness · 1 |
| Littleleaf sumac | hardiness · 1 |
| Live oak | hardiness · 1 |
| Loblolly pine | hardiness · 1 |
| Lombardy poplar | hardiness · 1 |
| Long leaf pine | hardiness · 1 |
| Low bush blueberry | hardiness · 1 |
| Madrone* | hardiness · 1 |
| Mahala mat | hardiness · 1 |
| Maiden grass | hardiness · 1 |
| Mammea americana | hardiness · 1 |
| Mangifera indica | hardiness · 1 |
| Manihot esculenta | hardiness · 1 |
| Manzanita, greenleaf | hardiness · 1 |
| Mapleleaf viburnum | hardiness · 1 |
| Mariposa Lily* | hardiness · 1 |
| May hawthorn | hardiness · 1 |
| Mayday Tree | hardiness · 1 |
| Meadow foxtail | hardiness · 1 |
| Meadowsweet | hardiness · 1 |
| Memorial rose | hardiness · 1 |
| Menyanthes trifoliata | hardiness · 1 |
| Mimosa | hardiness · 1 |
| Miner’s lettuce | hardiness · 1 |
| Missouri Goldenrod* | hardiness · 1 |
| Missouri iris | hardiness · 1 |
| Mistflower | hardiness · 1 |
| Mockernut hickory | hardiness · 1 |
| Mockorange | hardiness · 1 |
| Mockorange | hardiness · 1 |
| Mormon Tea | hardiness · 1 |
| Mountain ash | hardiness · 1 |
| Mountain Maple | hardiness · 1 |
| Mountain-laurel | hardiness · 1 |
| Mugo pine | hardiness · 1 |
| Muhly, Gulf | hardiness · 1 |
| Muscadine Grape | hardiness · 1 |
| Muttongrass* | hardiness · 1 |
| Myrica cerifera | hardiness · 1 |
| Nandina | hardiness · 1 |
| Nanking Cherry | hardiness · 1 |
| narrow-leaf cottonwood | hardiness · 1 |
| Nassella viridula | hardiness · 1 |
| Native Hop | hardiness · 1 |
| Netleaf Hackberry | hardiness · 1 |
| New Jersey tea | hardiness · 1 |
| Ninebark | hardiness · 1 |
| Ninebark | hardiness · 1 |
| Nootka falsecypress | hardiness · 1 |
| Norfolk Island Pine | hardiness · 1 |
| Northern Bedstraw | hardiness · 1 |
| Northern catalpa | hardiness · 1 |
| Northern white cedar | hardiness · 1 |
| Norway maple | hardiness · 1 |
| Norway spruce | hardiness · 1 |
| Nuttal oak | hardiness · 1 |
| Oak leaf hydrangea | hardiness · 1 |
| Oak, huckleberry | hardiness · 1 |
| Ocean spray | hardiness · 1 |
| Oceanspray | hardiness · 1 |
| Ocotillo | hardiness · 1 |
| Ohio buckeye | hardiness · 1 |
| Old-man Saltbush | hardiness · 1 |
| Oleander | hardiness · 1 |
| Olneya tesota | hardiness · 1 |
| Opuntia ficus-indica | hardiness · 1 |
| Orange butterfly weed | hardiness · 1 |
| Orange globe mallow | hardiness · 1 |
| Orchardgrass | hardiness · 1 |
| Oregon ash | hardiness · 1 |
| Oregon crabapple | hardiness · 1 |
| Oregon grape | hardiness · 1 |
| Oregon white oak | hardiness · 1 |
| Oriental arborvitae | hardiness · 1 |
| Osage orange | hardiness · 1 |
| Overcup oak | hardiness · 1 |
| Pacific bleeding heart | hardiness · 1 |
| Pacific Blue | hardiness · 1 |
| Pacific ninebark | hardiness · 1 |
| Pacific Rhododendron* | hardiness · 1 |
| Pacific/California wax myrtle | hardiness · 1 |
| Pagoda dogwood | hardiness · 1 |
| Painted buckeye | hardiness · 1 |
| Palmer Penstemon | hardiness · 1 |
| Palmetto | hardiness · 1 |
| Pampas grass | hardiness · 1 |
| Panicum maximum | hardiness · 1 |
| Paper birch | hardiness · 1 |
| Partridge pea | hardiness · 1 |
| Path rush | hardiness · 1 |
| Paw paw | hardiness · 1 |
| Peachleaf Willow | hardiness · 1 |
| Pear | hardiness · 1 |
| Pearly Everlasting | hardiness · 1 |
| Pecan | hardiness · 1 |
| Peppervine | hardiness · 1 |
| Perennial Ryegrass | hardiness · 1 |
| Periwinkle | hardiness · 1 |
| Perrenial Sweet Pea | hardiness · 1 |
| Persea palustris | hardiness · 1 |
| Persimmon | hardiness · 1 |
| Phragmites grass | hardiness · 1 |
| Picea mariana | hardiness · 1 |
| Piedmont azalea | hardiness · 1 |
| Pignut hickory | hardiness · 1 |
| Pin oak | hardiness · 1 |
| Pine, limber | hardiness · 1 |
| Pine, western white | hardiness · 1 |
| Pine, whitebark | hardiness · 1 |
| Pinemat Manzanita | hardiness · 1 |
| Pinion | hardiness · 1 |
| Pinus banksiana | hardiness · 1 |
| Pinus canariensis | hardiness · 1 |
| Pinus clausa | hardiness · 1 |
| Pinus glabra | hardiness · 1 |
| Pinus monophylla | hardiness · 1 |
| Pinus muricata | hardiness · 1 |
| Pinus sabiniana | hardiness · 1 |
| Pinus serotina | hardiness · 1 |
| Pinxterbloom azalea | hardiness · 1 |
| Piptatheropsis micrantha | hardiness · 1 |
| Pitch pine | hardiness · 1 |
| Plume Grass | hardiness · 1 |
| Podocarpus | hardiness · 1 |
| Poinciana | hardiness · 1 |
| Pokeweed | hardiness · 1 |
| Pomegranate | hardiness · 1 |
| Pond cypress | hardiness · 1 |
| Ponderosa pine | hardiness · 1 |
| Poppy mallow | hardiness · 1 |
| Port Orford cedar | hardiness · 1 |
| Possum-haw holly | hardiness · 1 |
| Post oak | hardiness · 1 |
| Prairie coneflower | hardiness · 1 |
| Prairie Coreopsis | hardiness · 1 |
| Prairie crabapple | hardiness · 1 |
| Prairie Junegrass | hardiness · 1 |
| Prairie Sage | hardiness · 1 |
| Prairie smoke | hardiness · 1 |
| Prickly Pear Cactus* | hardiness · 1 |
| Prostrate or dwarf baccharis | hardiness · 1 |
| Psidium guajava | hardiness · 1 |
| Pubescent wheatgrass | hardiness · 1 |
| Pumpkin ash | hardiness · 1 |
| Purple coneflower | hardiness · 1 |
| Purple Robe locust | hardiness · 1 |
| Purshia glandulosa | hardiness · 1 |
| Pussy willow | hardiness · 1 |
| Pyrus ussuriensis | hardiness · 1 |
| Quaking aspen | hardiness · 1 |
| Quercus douglasii | hardiness · 1 |
| Quercus kelloggii | hardiness · 1 |
| Quercus laevis | hardiness · 1 |
| Radiata pine | hardiness · 1 |
| Raspberry | hardiness · 1 |
| Red alder | hardiness · 1 |
| Red brome | hardiness · 1 |
| Red buckeye | hardiness · 1 |
| Red bud crabapple | hardiness · 1 |
| Red chokeberry | hardiness · 1 |
| Red Clover | hardiness · 1 |
| Red elderberry | hardiness · 1 |
| Red fir | hardiness · 1 |
| Red maple | hardiness · 1 |
| Red mulberry | hardiness · 1 |
| Red oak | hardiness · 1 |
| Red pine | hardiness · 1 |
| Red spruce | hardiness · 1 |
| Redflower Currant | hardiness · 1 |
| Redstem Ceanothus | hardiness · 1 |
| Rhodora | hardiness · 1 |
| Ribbon Grass | hardiness · 1 |
| River birch | hardiness · 1 |
| River red gum | hardiness · 1 |
| River Sheoak | hardiness · 1 |
| Rock cotoneaster | hardiness · 1 |
| Rocky Mountain Bee Plant | hardiness · 1 |
| Rocky Mountain juniper | hardiness · 1 |
| Rocky Mountain maple | hardiness · 1 |
| Rocky Mountain Penstemon | hardiness · 1 |
| Rosa rubiginosa | hardiness · 1 |
| Rose mallow | hardiness · 1 |
| Rosebay rhododendron | hardiness · 1 |
| Rudbeckia | hardiness · 1 |
| Rugose rose | hardiness · 1 |
| Russet Buffaloberry | hardiness · 1 |
| Russian olive | hardiness · 1 |
| Russian Wildrye | hardiness · 1 |
| S Seedless' Desert Willow | hardiness · 1 |
| Sabal minor | hardiness · 1 |
| Sagebrush | hardiness · 1 |
| Salal | hardiness · 1 |
| Sand Dropseed | hardiness · 1 |
| Sandberg Bluegrass | hardiness · 1 |
| Sargent crabapple | hardiness · 1 |
| Sassfras | hardiness · 1 |
| Saw palmetto | hardiness · 1 |
| Sawtooth oak | hardiness · 1 |
| Scarlet oak | hardiness · 1 |
| Scot's pine | hardiness · 1 |
| Scotch broom | hardiness · 1 |
| Scouler Willow | hardiness · 1 |
| Sea thrift | hardiness · 1 |
| Shadscale Saltbush | hardiness · 1 |
| Shagbark hickory | hardiness · 1 |
| Sheep Fescue | hardiness · 1 |
| Shellbark hickory | hardiness · 1 |
| Shingle oak | hardiness · 1 |
| Shooting Star | hardiness · 1 |
| Shortleaf pine | hardiness · 1 |
| Shrubby Penstemon | hardiness · 1 |
| Shrubby st. johnswort | hardiness · 1 |
| Shumard oak | hardiness · 1 |
| Siberian elm | hardiness · 1 |
| Siberian peashrub | hardiness · 1 |
| Siberian Wheatgrass | hardiness · 1 |
| Silktassel | hardiness · 1 |
| Silky dogwood | hardiness · 1 |
| Silky Oak | hardiness · 1 |
| Silver Buffaloberry | hardiness · 1 |
| Silver maple | hardiness · 1 |
| Silverberry | hardiness · 1 |
| Silvery lupine | hardiness · 1 |
| Slash pine | hardiness · 1 |
| Slender deutzia | hardiness · 1 |
| Slippery elm | hardiness · 1 |
| Small Burnet | hardiness · 1 |
| Small Cane | hardiness · 1 |
| Small-leaf arrowwood viburnum | hardiness · 1 |
| Smooth alder | hardiness · 1 |
| Smooth sumac | hardiness · 1 |
| Snakeweed | hardiness · 1 |
| Snowberry | hardiness · 1 |
| soaptree yucca | hardiness · 1 |
| Soft brome | hardiness · 1 |
| Soft rush | hardiness · 1 |
| Sourwood | hardiness · 1 |
| Southern catalpa | hardiness · 1 |
| Southern magnolia | hardiness · 1 |
| Southern red oak | hardiness · 1 |
| Southern sugar maple | hardiness · 1 |
| Sparkleberry | hardiness · 1 |
| Speckled alder | hardiness · 1 |
| Spicebush | hardiness · 1 |
| spike muhly | hardiness · 1 |
| Spindletree | hardiness · 1 |
| Spirea | hardiness · 1 |
| Splitbeard bluestem | hardiness · 1 |
| Spotted Alder | hardiness · 1 |
| Squirreltail Grass | hardiness · 1 |
| St. Johnswort | hardiness · 1 |
| Staghorn sumac | hardiness · 1 |
| Star magnolia | hardiness · 1 |
| Sticktight | hardiness · 1 |
| Striped maple | hardiness · 1 |
| Sugar bush | hardiness · 1 |
| Sugar cane | hardiness · 1 |
| Sugar hackberry | hardiness · 1 |
| Sugar maple | hardiness · 1 |
| Sugar pine | hardiness · 1 |
| Sulphur buckwheat | hardiness · 1 |
| Sumac | hardiness · 1 |
| Summersweet | hardiness · 1 |
| Sundrops | hardiness · 1 |
| Swamp azalea | hardiness · 1 |
| Swamp chestnut oak | hardiness · 1 |
| Swamp milkweed | hardiness · 1 |
| Swamp sunflower | hardiness · 1 |
| Swamp white oak | hardiness · 1 |
| Sweet azalea | hardiness · 1 |
| Sweetbay magnolia | hardiness · 1 |
| Sweetbells leucothoe | hardiness · 1 |
| Sweetfern | hardiness · 1 |
| Sweetleaf | hardiness · 1 |
| Switchcane | hardiness · 1 |
| Switchgrass | hardiness · 1 |
| Sycamore | hardiness · 1 |
| Sycamore maple | hardiness · 1 |
| Syzygium cumini | hardiness · 1 |
| Table mountain pine | hardiness · 1 |
| Tall fescue | hardiness · 1 |
| Tall oat-grass | hardiness · 1 |
| Tamarack | hardiness · 1 |
| Tamarindus indica | hardiness · 1 |
| Tatarian honeysuckle | hardiness · 1 |
| Taxus brevifolia | hardiness · 1 |
| Texas mountain laurel | hardiness · 1 |
| Thimbleberry | hardiness · 1 |
| Thornless honeylocust | hardiness · 1 |
| Tillandsia usneoides | hardiness · 1 |
| Timothy | hardiness · 1 |
| Titi | hardiness · 1 |
| Tree lupine | hardiness · 1 |
| Tree of heaven | hardiness · 1 |
| Trifolium hybridum | hardiness · 1 |
| Triticum aestivum | hardiness · 1 |
| True Mountain Mahogany | hardiness · 1 |
| Trumpet vine | hardiness · 1 |
| Tsuga heterophylla | hardiness · 1 |
| Tufted Hair Grass | hardiness · 1 |
| Tufted hairgrass | hardiness · 1 |
| Tulip-poplar | hardiness · 1 |
| Two-winged silverbell | hardiness · 1 |
| Umbrella magnolia | hardiness · 1 |
| Vaccinium uliginosum | hardiness · 1 |
| Valley oak | hardiness · 1 |
| Veldtgrass | hardiness · 1 |
| Vine maple | hardiness · 1 |
| Virgin's bower clematis | hardiness · 1 |
| Virginia Bluebells | hardiness · 1 |
| Virginia creeper | hardiness · 1 |
| Virginia pine | hardiness · 1 |
| Virginia rose | hardiness · 1 |
| Virginia sweetspire | hardiness · 1 |
| Wafer ash | hardiness · 1 |
| Walnut, Texas | hardiness · 1 |
| Washington hawthorn | hardiness · 1 |
| Water Birch | hardiness · 1 |
| Water oak | hardiness · 1 |
| Water tupelo | hardiness · 1 |
| Wax myrtle | hardiness · 1 |
| Wayfaringtree viburnum | hardiness · 1 |
| Weeping forsythia | hardiness · 1 |
| Weeping love grass | hardiness · 1 |
| Western arborvitae | hardiness · 1 |
| Western azalea | hardiness · 1 |
| Western balsam poplar | hardiness · 1 |
| Western Larch | hardiness · 1 |
| Western Mountain Ash* | hardiness · 1 |
| Western sandcherry | hardiness · 1 |
| Western spirea | hardiness · 1 |
| Western sycamore | hardiness · 1 |
| Western Wheatgrass | hardiness · 1 |
| Wheatgrass, intermediate and pubescent | hardiness · 1 |
| Whipple's Penstemon | hardiness · 1 |
| White alder | hardiness · 1 |
| White ash | hardiness · 1 |
| White clover | hardiness · 1 |
| White fir | hardiness · 1 |
| White Linden | hardiness · 1 |
| White mulberry | hardiness · 1 |
| White oak | hardiness · 1 |
| White pine | hardiness · 1 |
| White poplar | hardiness · 1 |
| White spruce | hardiness · 1 |
| White Stemless Evening Primrose | hardiness · 1 |
| White willow | hardiness · 1 |
| Whitegrass | hardiness · 1 |
| Wild bergamot | hardiness · 1 |
| Wild black cherry | hardiness · 1 |
| Wild Blue Flax | hardiness · 1 |
| Wild Red Cherry | hardiness · 1 |
| Wild strawberry | hardiness · 1 |
| Wildrye, creeping | hardiness · 1 |
| Willow oak | hardiness · 1 |
| Willowleaf cotoneaster | hardiness · 1 |
| Winged elm | hardiness · 1 |
| Winter King green hawthorn | hardiness · 1 |
| Winterberry holly | hardiness · 1 |
| Wintercreeper euonymus | hardiness · 1 |
| Winterfat | hardiness · 1 |
| Wintergreen | hardiness · 1 |
| Wintergreen barberry | hardiness · 1 |
| Wiregrass | hardiness · 1 |
| Wood’s rose | hardiness · 1 |
| Woolgrass bulrush | hardiness · 1 |
| Woolly yarrow | hardiness · 1 |
| Yaupon holly | hardiness · 1 |
| Yellow birch | hardiness · 1 |
| Yellow bird of paradise | hardiness · 1 |
| Yellow buckeye | hardiness · 1 |
| Yellow passionflower | hardiness · 1 |
| Yellow wild indigo | hardiness · 1 |
| Yellowwood | hardiness · 1 |
| Yucca aloifolia | hardiness · 1 |
| Zenobia | hardiness · 1 |
| Zoysiagrass | hardiness · 1 |