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Hardiness & climate
Cold-hardy (zone 4a or colder)
Taxa whose minimum survivable temperature is −30 °F or lower — suitable for hardiness zone 4a and colder. The Upper Plains, northern New England, the Mountain West interior.
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- max_temperature_f=-30
Showing 251–300 of 856.
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Circaea alpina L. CIALsmall enchanter's nightshade · Onagraceae -
Cirsium foliosum (Hook.) DC. CIFOelk thistle · Asteraceae -
Cladrastis kentukea (Dum. Cours.) Rudd CLKEKentucky yellowwood · Fabaceae -
Claytonia sibirica L. var. sibirica CLSISSiberian springbeauty · Portulacaceae -
Clematis ligusticifolia Nutt. CLLI2western white clematis · Ranunculaceae -
Clematis virginiana L. CLVI5devil's darning needles · Ranunculaceae -
Clintonia borealis (Aiton) Raf. CLBO3bluebead · Liliaceae -
Collinsia parviflora Lindl. COPA3maiden blue eyed Mary · Scrophulariaceae -
Comptonia peregrina (L.) J.M. Coult. COPE80sweet fern · Myricaceae -
Convallaria majalis L. COMA7European lily of the valley · Liliaceae -
Cornus alternifolia L. f. COAL2alternateleaf dogwood · Cornaceae -
Cornus amomum Mill. COAM2silky dogwood · Cornaceae -
Cornus racemosa Lam. CORA6gray dogwood · Cornaceae -
Cornus sericea L. ssp. occidentalis (Torr. & A. Gray) Fosberg COSEOwestern dogwood · Cornaceae - Cornus sericea L. ssp. sericea COSESredosier dogwood · Cornaceae
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Corydalis caseana A. Gray COCA15Sierra fumewort · Fumariaceae -
Corylus americana Walter COAM3American hazelnut · Betulaceae -
Corylus cornuta Marshall COCO6beaked hazelnut · Betulaceae -
Cotoneaster acutifolius Turcz. COAC2Peking cotoneaster · Rosaceae -
Cotoneaster apiculatus Rehder & E.H. Wilson COAP3cranberry cotoneaster · Rosaceae -
Crataegus crus-galli L. CRCR2cockspur hawthorn · Rosaceae -
Crataegus douglasii Lindl. CRDO2black hawthorn · Rosaceae -
Crataegus erythropoda Ashe CRERcerro hawthorn · Rosaceae -
Crataegus phaenopyrum (L. f.) Medik. CRPHWashington hawthorn · Rosaceae -
Crepis acuminata Nutt. CRAC2tapertip hawksbeard · Asteraceae -
Crepis runcinata (James) Torr. & A. Gray CRRU3fiddleleaf hawksbeard · Asteraceae -
Cyperus acuminatus Torr. & Hook. ex Torr. CYAC2tapertip flatsedge · Cyperaceae -
Cyperus strigosus L. CYSTstrawcolored flatsedge · Cyperaceae -
Dactylis glomerata L. DAGLorchardgrass · Poaceae -
Dalea candida Michx. ex Willd. var. candida DACACwhite prairie clover · Fabaceae -
Dalea purpurea Vent. var. purpurea DAPUPpurple prairie clover · Fabaceae -
Danthonia compressa Austin DACOflattened oatgrass · Poaceae -
Danthonia intermedia Vasey DAINtimber oatgrass · Poaceae -
Deschampsia cespitosa (L.) P. Beauv. DECEtufted hairgrass · Poaceae -
Deschampsia elongata (Hook.) Munro DEELslender hairgrass · Poaceae -
Deschampsia flexuosa (L.) Trin. DEFLwavy hairgrass · Poaceae -
Desmodium perplexum B.G. Schub. DEPE80perplexed ticktrefoil · Fabaceae -
Dichanthelium clandestinum (L.) Gould DICLdeertongue · Poaceae -
Dichanthelium latifolium (L.) Gould & C.A. Clark DILA8broadleaf rosette grass · Poaceae -
Dichanthelium scoparium (Lam.) Gould DISC3velvet panicum · Poaceae -
Distichlis spicata (L.) Greene DISPsaltgrass · Poaceae -
Dodecatheon meadia L. DOMEpride of Ohio · Primulaceae -
Dodecatheon pulchellum (Raf.) Merr. DOPUdarkthroat shootingstar · Primulaceae -
Dryas drummondii Richardson ex Hook. DRDRDrummond's mountain-avens · Rosaceae -
Dryas octopetala L. DROCeightpetal mountain-avens · Rosaceae -
Dryopteris cristata (L.) A. Gray DRCR4crested woodfern · Dryopteridaceae -
Dulichium arundinaceum (L.) Britton DUAR3three-way sedge · Cyperaceae -
Echinacea pallida (Nutt.) Nutt. ECPApale purple coneflower · Asteraceae -
Echinacea purpurea (L.) Moench ECPUeastern purple coneflower · Asteraceae -
Elaeagnus angustifolia L. ELANRussian olive · Elaeagnaceae