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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 351–400 of 856.
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Gaillardia aristata Pursh GAARblanketflower · Asteraceae -
Galium asprellum Michx. GAAS2rough bedstraw · Rubiaceae -
Galium boreale L. GABO2northern bedstraw · Rubiaceae -
Galium obtusum Bigelow GAOBbluntleaf bedstraw · Rubiaceae -
Galium tinctorium (L.) Scop. GATIstiff marsh bedstraw · Rubiaceae -
Galium trifidum L. GATR2threepetal bedstraw · Rubiaceae -
Gaultheria procumbens L. GAPR2eastern teaberry · Ericaceae -
Gaylussacia baccata (Wangenh.) K. Koch GABAblack huckleberry · Ericaceae -
Gentiana andrewsii Griseb. GEANclosed bottle gentian · Gentianaceae -
Gentiana clausa Raf. GECLbottle gentian · Gentianaceae -
Geranium richardsonii Fisch. & Trautv. GERIRichardson's geranium · Geraniaceae -
Geum canadense Jacq. GECA7white avens · Rosaceae -
Geum macrophyllum Willd. GEMA4largeleaf avens · Rosaceae -
Geum rivale L. GERI2purple avens · Rosaceae -
Geum triflorum Pursh GETRold man's whiskers · Rosaceae -
Glaux maritima L. GLMAsea milkwort · Primulaceae -
Gleditsia triacanthos L. GLTRhoneylocust · Fabaceae -
Glyceria borealis (Nash) Batchelder GLBOsmall floating mannagrass · Poaceae -
Glyceria canadensis (Michx.) Trin. GLCArattlesnake mannagrass · Poaceae -
Glyceria melicaria (Michx.) F.T. Hubbard GLME2melic mannagrass · Poaceae -
Glyceria striata (Lam.) Hitchc. GLSTfowl mannagrass · Poaceae -
Glycyrrhiza lepidota Pursh GLLE3American licorice · Fabaceae -
Grayia spinosa (Hook.) Moq. GRSPspiny hopsage · Chenopodiaceae -
Gutierrezia sarothrae (Pursh) Britton & Rusby GUSA2broom snakeweed · Asteraceae -
Gymnocladus dioicus (L.) K. Koch GYDIKentucky coffeetree · Fabaceae -
Hedysarum alpinum L. HEALalpine sweetvetch · Fabaceae -
Hedysarum boreale Nutt. HEBOUtah sweetvetch · Fabaceae -
Hedysarum sulphurescens Rydb. HESUwhite sweetvetch · Fabaceae -
Helenium autumnale L. HEAUcommon sneezeweed · Asteraceae -
Helianthus grosseserratus M. Martens HEGR4sawtooth sunflower · Asteraceae -
Helianthus nuttallii Torr. & A. Gray HENUNuttall's sunflower · Asteraceae -
Helianthus tuberosus L. HETUJerusalem artichoke · Asteraceae -
Heracleum maximum W. Bartram HEMA80common cowparsnip · Apiaceae -
Hesperostipa comata (Trin. & Rupr.) Barkworth ssp. comata HECOC8needle and thread · Poaceae -
Hesperostipa spartea (Trin.) Barkworth HESP11porcupinegrass · Poaceae -
Heterotheca villosa (Pursh) Shinners HEVI4hairy false goldenaster · Asteraceae - Heterotheca villosa (Pursh) Shinners var. villosa HEVIVhairy false goldenaster · Asteraceae
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Hieracium albiflorum Hook. HIAL2white hawkweed · Asteraceae -
Hieracium scouleri Hook. HISC2Scouler's woollyweed · Asteraceae -
Hierochloe odorata (L.) P. Beauv. HIODsweetgrass · Poaceae -
Hippuris vulgaris L. HIVU2common mare's-tail · Hippuridaceae -
Hordeum brachyantherum Nevski HOBR2meadow barley · Poaceae -
Hordeum vulgare L. HOVUcommon barley · Poaceae -
Hypericum boreale (Britton) E.P. Bicknell HYBO2northern St. Johnswort · Clusiaceae -
Hypericum calycinum L. HYCA10Aaron's beard · Clusiaceae -
Hypericum cistifolium Lam. HYCIroundpod St. Johnswort · Clusiaceae -
Hypericum punctatum Lam. HYPUspotted St. Johnswort · Clusiaceae -
Hypoxis hirsuta (L.) Coville HYHI2common goldstar · Liliaceae -
Iliamna rivularis (Douglas ex Hook.) Greene ILRIstreambank wild hollyhock · Malvaceae -
Juglans cinerea L. JUCIbutternut · Juglandaceae