14 - No frost at all, fatal, keep above 5C.
15 - Occasional light frost, at night down to -2C, during the
day above 5C.
16 - Frequent moderate frost, at night down to -7C, during the
day above 5C.
17 - Very frost hardy, at night down to -12C, during the day
above 0C.
18 - Often snow-covered, safe down to -20C, can withstand temperatures
below freezing for a long period of time!
19 - Hardy in the garden here in Denmark
19-20 Hardy in the garden here in Denmark, if the plant is protected
against winter moisture with a sheet of glass! will do very
well in a frame that are covered during the winter.
20 - Hardy in the garden here in Denmark, if the bed is protected
against winter moisture!
20-21 Not hardy in the here in Denmark, but if grown in pots
that are outside from late April to mid September and stored dry inside
an unheated greenhouse in the winter, or planted inside an unheated greenhouse.
21 - Hardy in an unheated greenhouse here in Denmark. (in pots
or planted in a well drained bed).
22 - Not very hardy, but can be grown in large pots, that are
outside in the summer, and are stored dry and frost free during the winter.
The links will take you to a picture of the plant in the photo gallery.
Genus: | Species: | cultivation type: | hardiness | Notes: |
Agave | lechuguilla | 21 | 16 | in a well drained bed |
Agave | havardiana | 21 | 17 | in a well drained bed |
Agave | parryi | 21 | 17 | in a well drained bed |
Agave | parryi var. neomexicana | 21 | 17 | in a well drained bed |
Agave | utahensis var. eborispina | 21 | 17 | in a well drained bed |
Agave | utahensis var. kaibabensis | 20 | 18 | in a well drained bed |
Agave | utahensis var. nevadensis | 21 | 17 | in a well drained bed |
Agave | utahensis var. utahensis | 21 | 17 | in a well drained bed |
Aloinopsis | spathulata | 21 | 17 | in a well drained bed |
Austrocactrus | gracilis | 21 | 17 | in a well drained bed |
Chamaecereus | silvestrii | 21 | 17 | in a well drained bed |
Coryphantha | echinus | 21 | 16-17 | in pots |
Crassula | milfordiae | 19-20 | 18 | in a well drained bed or pots in a frame |
Cylindropuntia | davisii | 20 | 18 | in pots |
Cylindropuntia | echinocarpa | 21 | 17 | |
Cylindropuntia | imbricata var. arborescens | 20 | 18 | |
Cylindropuntia | imbricata var. arborescens 'Cristata' | 20 | 18 | |
Cylindropuntia | imbricata var. arborescens 'Red Tower' | 20 | 18 | |
Cylindropuntia | imbricata var. arborescens 'White Tower' | 20 | 18 | |
Cylindropuntia | imbricata var. arborescens forma albiflora | 20 | 18 | |
Cylindropuntia | kleiniae | 21 | 18 | |
Cylindropuntia | leptocaulis | 21 | 18 | |
Cylindropuntia | spinosior | 21 | 17 | |
Cylindropuntia | viridiflora | 20 | 18 | |
Cylindropuntia | whipplei | 21 | 18 | |
Cylindropuntia | whipplei forma minor | 21 | 18 | |
Cylindropuntia | whipplei var. montana (name invalid) | 21 | 18 | |
Delosperma | cooperi | 19 | 18 | |
Delosperma | nubrigenum HORT | 20 | 18 | |
Delosperma | nubrigenum | 20 | 18 | |
Delosperma | sp. ' white flowers ' | 21 | 18 | |
Drosanthemum | hispidum | ? | ? | |
Echinocactus | xeranthemoides | ? | ? | |
Echinocereus | albispinus | 21 | 18 | |
Echinocereus | baileyi | |||
Echinocereus | caespitosus | 20 | 18 | |
Echinocereus | caespitosus var. castaneus | 21 | 18 | |
Echinocereus | chloranthus | 21 | 18 | |
Echinocereus | chloranthus var. cylindricus | 21 | 18 | |
Echinocereus | chloranthus var. cylindricus forma correllii | 21 | 18 | |
Echinocereus | chloranthus var. russanthus | 21 | 18 | |
Echinocereus | coccineus | 20 | 18 | |
Echinocereus | coccineus var. gurneyi | 20 | 18 | |
Echinocereus | coccineus var. paucispinus | 21 | 18 | |
Echinocereus | dasyacanthus | 21 | 18 | |
Echinocereus | davisii | 21 | 18 | |
Echinocereus | fendleri | 21 | 18 | |
Echinocereus | fendleri var. kuenzleri | 21-22 | 16 | |
Echinocereus | fendleri var. rectispinus | 21 | 18 | |
Echinocereus | ledingii | 21 | 17 | |
Echinocereus | reichenbachii 'Oklahomensis' = caespitosus | 21 | 18 | |
Echinocereus | reichenbachii var. albispinus = Echinocereus albispinus | 21 | 18 | |
Echinocereus | reichenbachii var. baileyi = Echinocereus baileyi | 20 | 18 | |
Echinocereus | reichenbachii var. perbellus | 21 | 18 | |
Echinocereus | roemeri | 21 | 18 | |
Echinocereus | rosei | 21 | 18 | |
Echinocereus | triglochidiatus | 19-20 | 18 | |
Echinocereus | triglochidiatus 'Sub Nudus' | 21 | 18 | |
Echinocereus | triglochidiatus f. inermis | 19-20 | 18 | |
Echinocereus | triglochidiatus var. arizonicus | 21 | 18 | |
Echinocereus | triglochidiatus var. gonacanthus | 20 | 18 | |
Echinocereus | triglochidiatus var. gurneyi | 20 | 18 | |
Echinocereus | triglochidiatus var. melanacanthus | 20 | 18 | |
Echinocereus | triglochidiatus var. mojavensis | 19-20 | 18 | |
Echinocereus | triglochidiatus var. mojavensis forma inermis | 19-20 | 18 | |
Echinocereus | viridiflorus | 19-20 | 18 | |
Echinocereus | viridiflorus ' Spinosior ' | 20 | 18 | |
Echinocereus | X caespitosus X triglochidiatus 'Sub Nudus' F:1 hybrid | ? | ||
Echinocereus | X coccineus X viridiflorus F:1 hybrid | ? | ||
Echinocereus | X fendleri X triglochidiatus 'Sub Nudus' F:1 hybrid | ? | ||
Echinocereus | X roetteri | ? | ||
Echinocereus | X triglochidiatus var. mojavensis X rosei F:1 hybrid | ? | ||
Echinocereus | X triglochidiatus var. mojavensis X reichenbachii var. albispinus F:1 hybrid | ? | ||
Echinocereus | X viridiflorus X coccineus F:1 hybrid | ? | ||
Echinocereus | X viridiflorus X triglochidiatus var. mojavensis F:1 hybrid | ? | ||
Echinomastus | dasyacanthus | 21 | 17 | |
Escobaria | minima | 21 (20) | 17-18 | |
Escobaria | missouriensis | 21 | 18 | |
Escobaria | missouriensis ssp. navajoensis | 21 | 17 | |
Escobaria | missouriensis var. caespitosa | 21 | 18 | |
Escobaria | sneedii | 20 | 18 | |
Escobaria | vivipara | 20 | 18 | |
Escobaria | vivipara var. arizonica | 20 | 18 | |
Escobaria | vivipara var. bisbeana | 21 | 18 | |
Escobaria | vivipara var. kaibabensis | 21 | 18 | |
Escobaria | vivipara var. neomexicana | 20 | 18 | |
Escobaria | X vivipara var. neomexicana X missouriensis F:1 hybrid | ? | ? | |
Escobaria | X vivipara var. arizonica X missouriensis F:1 hybrid | ? | ? | |
Escobaria | X vivipara var. arizonica X missouriensis F:1 hybrid | ? | ? | |
Ferocactus | hamatacanthus | 22 | 16 | |
Ferocactus | wislizenii | 22 | 16 | |
Grusonia | clavata | 21 | 18 | |
Grusonia | pulchella | 21 | 18 | |
Gymnocalysium | bruchii | 21 | 17 | |
Gymnocalysium | ||||
Gymnocalysium | gibosum var., nigrum | 21 | 17 | |
Hesperaloe | parviflora | 21 | ? | |
Jovibarba | arenaria | 19 | 18 | |
Jovibarba | hirta ssp. glabrescens | 19 | 18 | |
Lewisia | brachycalyx | 19 | 18 | |
Lewisia | columbiana | 19 | 18 | |
Lewisia | columbiana ssp. rupicola | 19 | 18 | |
Lewisia | columbiana ssp. rupicola ' Rosea ' | 19 | 18 | |
Lewisia | congdonii | 19 | 18 | |
Lewisia | cotyledon | 19 | 18 | |
Lewisia | cotyledon forma alba | 19 | 18 | |
Lewisia | cotyledon ssp. heckneri | 19 | 18 | |
Lewisia | longipetala | 19 | 18 | |
Lewisia | nevadensis | 19 | 18 | |
Lewisia | oppositifolia ' Dwarf form ' | 19 | 18 | |
Lewisia | pygmaea | 19 | 18 | |
Lewisia | rediviva | 19 | 18 | |
Lewisia | sierrae | 19 | 18 | |
Lewisia | tweedyi | 19-20 | 18 | |
Maihuenia | patagonica | 21 | 18 | |
Maihuenia | poeppegii | 20 | 18 | |
Maihuenia | tehuelches = patagonica | 21 | 18 | |
Maihuenopsis | darwinii | 21 | 18 | |
Mammillaria | heyderi var. applanata | 21 | 17 | |
Mammillaria | meiacantha | 21 | 17-18 | mine died after a wet winter with high humidity |
Mammillaria | wrightii | 21 | 17-18 | |
Mammillaria | wrightii var. wilcoxii | 21 | 17 | |
Manfreda | virginica | ? | ? | |
Navajoa | maia | 21 | 18 | |
Navajoa | peeblesianus 'Maja' | 21 | 18 | |
Navajoa | peeblesianus ssp. fickeisenii | 21 | 18 | |
Navajoa | peeblesianus var. menzelii | 21 | 18 | |
Neolloidia | johnsonii var. lutescens | 21 | 17 | |
Opuntia | 'Apache' | 19-20 | 18 | |
Opuntia | 'Budapest' | 19 | 18 | |
Opuntia | 'Claude Arno' | 19-20 | 18 | |
Opuntia | 'Flora Rosea' | 19-20 | 18 | |
Opuntia | 'Georg Sydow' | 19-20 | 18 | |
Opuntia | 'Haestrup ' | 19 | 18 | |
Opuntia | 'Rutilans' | 19 | 18 | |
Opuntia | 'Smithwick' | 19 | 18 | |
Opuntia | 'Super Rutila' | 19-20 | 18 | |
Opuntia | arenaria | 21 | 18 | |
Opuntia | aurea | 20 | 18 | |
Opuntia | aurea forma nicholii | 21 | 18 | |
Opuntia | basilaris | 21 | 18 | |
Opuntia | basilaris var. brachyclada | 21 | 18 | |
Opuntia | basilaris var. heilii ? | 21 | 18 | |
Opuntia | basilaris var. longiareolata | 21 | 18 | |
Opuntia | basilaris var. ramosa | 21 | 18 | |
Opuntia | basilaris var. woodburyi = O. aurea | 21 | 18 | |
Opuntia | cymochila | 20 | 18 | |
Opuntia | cymochila ' Malpais Glory ' | 20 | 18 | |
Opuntia | decumbens | 21 | 18 | |
Opuntia | drumondii | 21 | 18 | |
Opuntia | engelmanii var. cyclodes | 20 | 18 | |
Opuntia | fragilis ' brooksii' | 19 | 18 | |
Opuntia | fragilis 'Bronze Beauty ' | 19-20 | 18 | |
Opuntia | fragilis 'Devil Thumb' | 19-20 | 18 | |
Opuntia | fragilis 'Little Grey Mound' | 19-20 | 18 | |
Opuntia | fragilis 'Smørblomst' | 19 | 18 | |
Opuntia | fragilis "Wenatchee" | 19-20 | 18 | |
Opuntia | fragilis forma brachycantha | 19-20 | 18 | |
Opuntia | fragilis forma caespitosa | 19-20 | 18 | |
Opuntia | fragilis forma denudata | 19-20 | 18 | |
Opuntia | fragilis forma denudata PINK | 19-20 | 18 | |
Opuntia | fragilis var. fragilis | 19 | 18 | |
Opuntia | fragilis var. fragilis ' b' | 19-20 | 18 | |
Opuntia | fragilis X polyacantha | 19-20 | 18 | |
Opuntia | gilvescens | 19-20 | 18 | |
Opuntia | grandiflora | 21 | 18 | |
Opuntia | humifusa | 19 | 18 | |
Opuntia | humifusa 'NKS 130' | 19 | 18 | |
Opuntia | humifusa mini form | ? | 18 | |
Opuntia | humifusa var. pollardii | 19-20 | 18 | |
Opuntia | littoralis var. martiniana | 19-20 | 18 | |
Opuntia | loomisii | 20 | 18 | |
Opuntia | mackensenii | 20 | 18 | |
Opuntia | macrocentra var. castatteri | 21 | 17 | |
Opuntia | macrorhiza | 19 | 18 | |
Opuntia | macrorhiza var. spaerocarpa | 19-20 | 18 | |
Opuntia | macrorhiza var. stenochila | 19-20 | 18 | |
Opuntia | phaeacantha | 19-20 | 18 | |
Opuntia | phaeacantha 'Plum' | 19-20 | 18 | |
Opuntia | phaeacantha 'Rubrispina' | 19-20 | 18 | |
Opuntia | phaeacantha var. ' Arenacea ' | 19-20 | 18 | |
Opuntia | phaeacantha var. ' Major ' | 19-20 | 18 | |
Opuntia | phaeacantha var. ' Sylvatica ' | 19-20 | 18 | |
Opuntia | phaeacantha var. camanchica | 19-20 | 18 | |
Opuntia | phaeacantha var. camanchica f. albispina ? | 19-20 | 18 | |
Opuntia | phaeacantha var. gigantea | 19-20 | 18 | |
Opuntia | phaeacantha var. longispina | 19-20 | 18 | |
Opuntia | phaeacantha var. major | 19-20 | 18 | |
Opuntia | phaeacantha var. nigricans | 19-20 | 18 | |
Opuntia | phaeacantha var. paucispina | 19-20 | 18 | |
Opuntia | phaeacantha var. pierci | 19-20 | 18 | |
Opuntia | phaeacantha var. rubra | 19-20 | 18 | |
Opuntia | phaeacantha var. tenuispina | 19-20 | 18 | |
Opuntia | polyacantha ' Carmin ' | 19 | 18 | |
Opuntia | polyacantha ' Chartreuse' | 19-20 | 18 | |
Opuntia | polyacantha ' X200 Baby ' | 19-20 | 18 | |
Opuntia | polyacantha 'Colorado Red' | 19-20 | 18 | |
Opuntia | polyacantha 'Crystal Tide' | 19-20 | 18 | |
Opuntia | polyacantha 'Orange Glory' | 20 | 18 | |
Opuntia | polyacantha 'Orange Nebraska' | 19-20 | 18 | |
Opuntia | polyacantha 'Red Glory' | 20 | 18 | |
Opuntia | polyacantha 'Utah Sunset' | 20 | 18 | |
Opuntia | polyacantha var. erinacea | 19-20 | 18 | |
Opuntia | polyacantha var. erinacea 'Red spine Grizzly Bear' | 19-20 | 18 | |
Opuntia | polyacantha var. erinacea forma ursina | 21 | 18 | |
Opuntia | polyacantha var. hystricina | 19-20 | 18 | |
Opuntia | polyacantha var. hystricina ' Roseiflora ' | 19-20 | 18 | |
Opuntia | polyacantha var. hystricina ' Rubrispina ' | 19-20 | 18 | |
Opuntia | polyacantha var. hystricina ' Porcupine ' | 19-20 | 18 | |
Opuntia | polyacantha var. juniperina | 19-20 | 18 | |
Opuntia | polyacntha var. polyacantha | |||
Opuntia | polyacantha var. rhodantha | 19-20 | 18 | |
Opuntia | polyacantha var. rhodantha 'Greenhorn' | 19-20 | 18 | |
Opuntia | polyacantha var. rhodantha 'Purple Knight ' | 19-20 | 18 | |
Opuntia | polyacantha var. rhodantha 'xanthostemma elegans' | 19-20 | 18 | |
Opuntia | polyacantha var. rhodantha 'xanthostemma Jena' | 19-20 | 18 | |
Opuntia | polyacantha var. rhodantha cv. pisciformis | 19-20 | 18 | |
Opuntia | polyacantha var. rhodantha cv. shumaniana | 19-20 | 18 | |
Opuntia | polyacantha var. rhodantha cv. rosea | 19-20 | 18 | |
Opuntia | polyacantha var. rhodantha cv. xanthostemma rosea | 19-20 | 18 | |
Opuntia | polyacantha var. rufispina = var. polyacantha | 19 | 18 | |
Opuntia | polyacantha var. schweriana | 19-20 | 18 | |
Opuntia | polyacantha var. utahensis | 19-20 | 18 | |
Opuntia | polyacantha X fragilis | 19-20 | 18 | |
Opuntia | pottsii | 19-20 | 18 | |
Opuntia | pottsii var. montana | 19-20 | 18 | |
Opuntia | pottsii X phaeacantha | 19-20 | 18 | |
Opuntia | pusilla | 21 | 18 | |
Opuntia | rutila | 19-20 | 18 | |
Opuntia | sandiana | 21 | 18 | |
Opuntia | sanguinicula | 21 | 17 | |
Opuntia | santa rita | 21 | 17 | |
Opuntia | sp. nov. (from CO, SD & NB) (O. ogallalae, name not published yet!) | 19-20 | 18 | HUGE flowers! |
Opuntia | stanleyi | 21 | 17 | |
Opuntia | tardospina | 19-20 | 18 | |
Opuntia | tortispina | 19 | 18 | |
Opuntia | tortispina ' Dwarf form ' | 19-20 | 18 | |
Opuntia | trichophora | 19-20 | 18 | |
Opuntia | trichophora nova | 19-20 | 18 | |
Opuntia | woodsii | 20 | 18 | |
Opuntia | xcolumbiana | 19-20 | 18 | |
Opuntia | xanthostemma 'Rosea' = polyacantha var. rhodantha cv. xanthostemma rosea | 19-20 | 18 | |
Opuntia | zuniensis | 19-20 | 18 | |
Orostachys | furysii | 20 | 18 | |
Orostachys | iwargenge | 19-20 | 18 | |
Orostachys | spinosa | 19-20 | 18 | |
Pediocactus | bradyi | 21 | 18 | |
Pediocactus | bradyi ssp. despainii | 21 | 18 | |
Pediocactus | bradyi ssp. winkleri | 21 | 18 | |
Pediocactus | nigrispinus ssp nigrispinus | 21 | 18 | |
Pediocactus | paradinei | 21 | 18 | |
Pediocactus | sileri | 21 | 18 | |
Pediocactus | simpsonii | 21 | 18 | |
Pediocactus | simpsonii f. campestris | 21 | 18 | |
Pediocactus | simpsonii f. dinosauriensis | 21 | 18 | |
Pediocactus | simpsonii f. flaminggorgensis | 21 | 18 | |
Pediocactus | simpsonii f. kuenzleri | 21 | 18 | |
Pediocactus | simpsonii f. montanus | 21 | 18 | |
Pediocactus | simpsonii ssp. bensonii | 21 | 18 | |
Pediocactus | simpsonii ssp. campestris | 21 | 18 | |
Pediocactus | simpsonii ssp. idahoensis | 21 | 18 | |
Pediocactus | simpsonii ssp. indraianus | 21 | 18 | |
Pediocactus | simpsonii ssp. robustior | 21 | 18 | |
Pediocactus | simpsonii ssp. simpsonii | 21 | 18 | |
Phemeranthus | confertiflorus | 20 | 18 | |
Phemeranthus | sediforme | 19 | 18 | |
Phemeranthus | spirescens | 19-20 | 18 | |
Phemeranthus | validulus | 21 | 17 | |
Polianthes | virginica | ? | ? | |
Rhodiola | algida | 19 | 18 | |
Rhodiola | arctica | 19 | 18 | |
Rhodiola | semenowii | 19 | 18 | |
Sclerocactus | parviflorus | 21 | 18 | |
Sclerocactus | pubispinus | 21 | 18 | |
Sclerocactus | wetlandicus ssp. ilseae | 21 | 18 | |
Sclerocactus | whipplei | 21 | 18 | |
Sclerocactus | wrightiae | 21 | 18 | |
Sedum | acre | 19 | 18 | |
Sedum | album | 19 | 18 | |
Sedum | anacamperos | 19 | 18 | |
Sedum | bupleuroides | 19 | 18 | |
Sedum | cauticolum | 19 | 18 | |
Sedum | dasyphyllum | 19 | 18 | |
Sedum | dasyphyllum var. microphyllum | 19 | 18 | |
Sedum | divergens | 19 | 18 | |
Sedum | kamtschaticum f. variegata | 19 | 18 | |
Sedum | lanseolatum | 19 | 18 | |
Sedum | minimum | 19 | 18 | |
Sedum | oreganum var. procumbens | 19 | 18 | |
Sedum | pachyclados | 19 | 18 | |
Sedum | reflexum | 19 | 18 | |
Sedum | reflexum f. cristata | 19 | 18 | |
Sedum | reflexum variegata cristata | 19 | 18 | |
Sedum | spathulifolium | 19 | 18 | |
Sedum | spurium | 19 | 18 | |
Sedum | tartarinowii | 19 | 18 | |
Sedum | telephium | 19 | 18 | |
Sempervivum | ' Alpha ' | 19 | 18 | |
Sempervivum | ' Beta ' | 19 | 18 | |
Sempervivum | ' Cleveland ' | 19 | 18 | |
Sempervivum | ' Director Jacobs ' | 19 | 18 | |
Sempervivum | ' Gamma ' | 19 | 18 | |
Sempervivum | ' Grey Ladies ' | 19 | 18 | |
Sempervivum | ' Majlands Hybrid ' | 19 | 18 | |
Sempervivum | ' Red & Green ' f. cristata | 19 | 18 | |
Sempervivum | ' Red & Green ' | 19 | 18 | |
Sempervivum | ' Rose Agnes ' | 19 | 18 | |
Sempervivum | ' Thomayeri ' | 19 | 18 | |
Sempervivum | ' Westelin ' | 19 | 18 | |
Sempervivum | 'Limelight' | 19 | 18 | |
Sempervivum | 'Rosie' | 19 | 18 | |
Sempervivum | allionii | 19 | 18 | |
Sempervivum | arachnoideum | 19 | 18 | |
Sempervivum | arachnoideum v. tomentosum | 19 | 18 | |
Sempervivum | ballsii | 19 | 18 | |
Sempervivum | calcareum | 19 | 18 | |
Sempervivum | dzhavachischvilii | 19 | 18 | |
Sempervivum | kosanii | 19 | 18 | |
Sempervivum | mamoreum var. dinaricum | 19 | 18 | |
Sempervivum | montanum var. stiriacum | 19 | 18 | |
Sempervivum | pseudoornatum | 19 | 18 | |
Sempervivum | reginae-amaliae | 19 | 18 | |
Sempervivum | rubrifolium | 19 | 18 | |
Sempervivum | schnittspahnii | 19 | 18 | |
Sempervivum | settilum rubrifolium | 19 | 18 | |
Sempervivum | vicentei | 19 | 18 | |
Sempervivum | violaceum | 19 | 18 | |
Sempervivum | x barbululatum cv. hookeri | 19 | 18 | |
Tephrocactus | articulatus | 21 | 17 | |
Tephrocactus | haematacantha | 21 | 17 | |
Tephrocactus | verschaffeldtii | 21 | 17 | |
Toumeya | papyracantha | 21 | 18 | |
Yucca | look at "Benny's Yucca page; Yucca hardiness" |
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