Canada's Plant Hardiness Site

Data have been entered for 7138 species.

(Last updated Wed Jan 14 11:46:39 EST 2015)
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Hackelia deflexa nodding stickseed
Hackelia deflexa var. americana nodding stickseed
Hackelia diffusa var. diffusa spreading hackelia
Hackelia floribunda western stickseed
Hackelia micrantha blue stickseed
Hackelia virginiana Virginia stickseed
Hakonechloa macra hakone grass
Halenia deflexa spurred gentian
Halenia deflexa subsp. deflexa
Halerpestes cymbalaria alkali buttercup
Halesia carolina little silverbell
Halesia diptera two-wing silverbell
Halesia parviflora
Halimiocistus wintonensis hybrid sunrose
Halimium lasianthum dwarf yellow sunrose
Halimodendron halodendron salt tree
Hamamelis mollis Chinese witchhazel
Hamamelis vernalis vernal witchhazel
Hamamelis virginiana American witchhazel
Hamamelis Xintermedia hybrid witch hazel
Harrimanella hypnoides
Hartwrightia floridana
Hasteola suaveolens
Hebe odora mountain box
Hebe pinguifolia disc-leaf Hebe
Hedeoma hispida mock pennyroyal
Hedeoma pulegioides pudding-grass
Hedera colchica colchis ivy
Hedera helix English ivy
Hedysarum alpinum liquorice root
Hedysarum boreale boreal sweetvetch
Hedysarum boreale subsp. mackenzii Mackenzie's sweetvetch
Hedysarum occidentale
Hedysarum sulphurescens
Helanthium tenellum pygmy chainswort
Helenium autumnale common sneezeweed
Helenium autumnale Hybrids autumn helenium
Helenium flexuosum nakedflower sneezeweed
Helenium virginicum
Helianthella castanea
Helianthella uniflora Rocky Mountain helianthella
Helianthemum canadense longbranched frostweed
Helianthemum nummularium common rockrose
Helianthemum nummularium Hybrids rock rose
Helianthus angustifolius narrowleaf sunflower
Helianthus annuus common sunflower
Helianthus decapetalus ten-rayed sunflower
Helianthus divaricatus woodland sunflower
Helianthus eggertii
Helianthus giganteus giant sunflower
Helianthus grosseserratus sawtooth sunflower
Helianthus hirsutus hairy sunflower
Helianthus laevigatus
Helianthus maximiliani Maximilian's sunflower
Helianthus mollis ashy sunflower
Helianthus nuttallii Nuttall's sunflower
Helianthus nuttallii subsp. rydbergii Rydberg's sunflower
Helianthus occidentalis fewleaf sunflower
Helianthus pauciflorus stiff sunflower
Helianthus pauciflorus subsp. pauciflorus stiff sunflower
Helianthus pauciflorus subsp. subrhomboideus rhombic-leaf sunflower
Helianthus petiolaris prairie sunflower
Helianthus salicifolius willowleaf sunflower
Helianthus schweinitzii
Helianthus strumosus paleleaf sunflower
Helianthus tuberosus Jerusalem artichoke
Helianthus Xlaetiflorus beautiful sunflower
Helictotrichon sempervirens blue oat grass
Heliopsis helianthoides false sunflower
Heliopsis helianthoides var. scabra sweet oxeye
Heliotropium curassavicum salt heliotrope
Helleborus foetidus stinking hellebore
Helleborus lividus subsp. corsicus Corsican hellebore
Helleborus niger black hellebore
Helleborus orientalis Lenten rose
Helleborus orientalis subsp. abchasicus early purple hellebore
Helleborus Xhybridus Lenten rose hybrids
Helleborus Xsternii Stern's hybrid hellebore
Helminthotheca echioides bristly oxtongue
Helonias bullata
Hemerocallis 'Catherine Woodbery' Daylily
Hemerocallis 'Eenie Weenie' Daylily
Hemerocallis 'Happy Returns' Daylily
Hemerocallis 'Hyperion' Daylily
Hemerocallis 'Luxury Lace' Daylily
Hemerocallis 'Pardon Me' Daylily
Hemerocallis 'Stella de Oro' Daylily
Hemerocallis Hybrids - others not listed here Daylily
Hemerocallis altissima altissima daylily
Hemerocallis citrina citron daylily
Hemerocallis fulva tawny daylily
Hemerocallis lilioasphodelus lemon daylily
Heptacodium miconioides northern crape myrtle
Heracleum mantegazzianum giant hogweed
Heracleum maximum cow parsnip
Heracleum sphondylium hogweed
Heracleum sphondylium subsp. sibiricum masterwort
Herniaria glabra smooth rupturewort
Hesperia dacotae Dakota skipper
Hesperia ottoe ottoe skipper
Hesperia uncas uncas skipper
Hesperis matronalis mother-of-the-evening
Hesperochiron pumilus dwarf hesperochiron
Hesperostipa comata needle-and-thread
Hesperostipa comata subsp. comata needle-and-thread
Hesperostipa spartea porcupinegrass
Heteranthera dubia water stargrass
Heterocodon rariflorus western pearlflower
Heterotheca villosa hairy goldenaster
Heterotheca villosa var. villosa hairy goldenaster
Heuchera americana American alumroot
Heuchera americana Hybrids rock geranium
Heuchera chlorantha tall alumroot
Heuchera cylindrica roundleaf alumroot
Heuchera glabra smooth alumroot
Heuchera grossulariifolia gooseberryleaf alumroot
Heuchera grossulariifolia var. tenuifolia gooseberryleaf alumroot
Heuchera micrantha crevice alumroot
Heuchera micrantha var. diversifolia Pacific alumroot
Heuchera parvifolia littleleaf alumroot
Heuchera richardsonii Richardson's alumroot
Heuchera sanguinea coralbells
Heuchera Xbrizoides fancyleaf coralbells
Hexalectris spicata
Hexastylis arifolia heartleaf
Hexastylis naniflora dwarf-flower heartleaf
Hexastylis virginica Virginia heartleaf
Hibiscus coccineus scarlet rosemallow
Hibiscus laevis soldier mallow
Hibiscus lasiocarpos hairyfruit hibiscus
Hibiscus moscheutos swamp rosemallow
Hibiscus moscheutos subsp. moscheutos swamp rosemallow
Hibiscus syriacus rose-of-Sharon
Hibiscus trionum flower-of-an-hour
Hibiscus Xmoscheutos Hybrids hardy hibiscus
Hieracium albiflorum white hawkweed
Hieracium bolanderi
Hieracium caespitosum field hawkweed
Hieracium gronovii Gronovius' hawkweed
Hieracium longipilum hairy hawkweed
Hieracium murorum wall hawkweed
Hieracium paniculatum panicled hawkweed
Hieracium robinsonii épervière de Robinson
Hieracium scabrum rough hawkweed
Hieracium scouleri Scouler's hawkweed
Hieracium tridentatum threetooth hawkweed
Hieracium triste woolly hawkweed
Hieracium umbellatum umbellate hawkweed
Hieracium venosum rattlesnake hawkweed
Hieracium vulgatum common hawkweed
Hippophaë rhamnoides sea buckthorn
Hippuris montana
Hippuris tetraphylla fourleaf mare's tail
Hippuris vulgaris common mare's tail
Holcus lanatus Yorkshire fog
Holodiscus discolor creambush
Holosteum umbellatum jagged chickweed
Honckenya peploides seabeach sandwort
Honckenya peploides subsp. robusta eastern seabeach sandwort
Hordeum brachyantherum northern barley
Hordeum jubatum squirreltail barley
Hordeum jubatum subsp. jubatum squirreltail barley
Hordeum marinum subsp. gussonianum geniculate barley
Hordeum pusillum little wild barley
Hordeum vulgare barley
Hornungia procumbens spreading hutchinsia
Hosta 'August Moon' August Moon hosta
Hosta 'Krossa Regal' Krossa Regeal hosta
Hosta 'Sum and Substance' Sum and Substance hosta
Hosta 'Wide Brim' Wide Brim hosta
Hosta Hybrids - others not listed here plantain lily
Hosta Tardiana Group hosta
Hosta fluctuans Sagae hosta
Hosta fortunei plantain lily
Hosta lancifolia narrowleaf plantain lily
Hosta montana largeleaf hosta
Hosta plantaginea fragrant plantain lily
Hosta sieboldiana giant blue hosta
Hosta sieboldii
Hosta undulata plantain lily
Hosta ventricosa blue plantain lily
Hottonia inflata American featherfoil
Houstonia caerulea azure bluets
Houstonia canadensis fringed houstonia
Houstonia longifolia longleaf bluet
Houstonia ouachitana
Houttuynia cordata 'Chameleon' chameleon plant
Hovenia dulcis Japanese raisin tree
Howellia aquatilis water howellia
Hudsonia tomentosa woolly heather
Hulteniella integrifolia entireleaf daisy
Humulus japonicus Japanese hop
Humulus lupulus common hops
Humulus lupulus var. lupuloides American hop
Humulus lupulus var. lupulus common hop
Huperzia appressa mountain firmoss
Huperzia haleakalae alpine firmoss
Huperzia lucidula shining firmoss
Huperzia miyoshiana Pacific firmoss
Huperzia occidentalis western firmoss
Huperzia selago northern firmoss
Huperzia Xprotoporophila rock firmoss
Hyacinthoides hispanica Spanish bluebell
Hyacinthoides non-scripta English bluebell
Hyacinthus orientalis hyacinth
Hybanthus concolor eastern green violet
Hydrangea anomala subsp. petiolaris climbing hydrangea
Hydrangea arborescens tree hydrangea
Hydrangea aspera fuzzyleaf hydrangea
Hydrangea involucrata Japanese hydrangea
Hydrangea macrophylla lacecap hydrangea
Hydrangea paniculata peegee hydrangea
Hydrangea quercifolia oakleaf hydrangea
Hydrastis canadensis goldenseal
Hydrocharis morsus-ranae European frogbit
Hydrocotyle americana American marsh pennywort
Hydrocotyle ranunculoides floating marsh pennywort
Hydrocotyle umbellata marsh pennywort
Hydrocotyle verticillata whorled marsh pennywort
Hydrophyllum appendiculatum appendage waterleaf
Hydrophyllum canadense broadleaf waterleaf
Hydrophyllum capitatum ballhead waterleaf
Hydrophyllum fendleri Fendler's waterleaf
Hydrophyllum macrophyllum
Hydrophyllum tenuipes Pacific waterleaf
Hydrophyllum virginianum Virginia waterleaf
Hylocomium splendens stairstep moss
Hylodesmum glutinosum large tick-trefoil
Hylodesmum nudiflorum nakedflower tick-trefoil
Hylotelephium telephioides Alleghany stonecrop
Hylotelephium telephium orpine
Hylotelephium telephium subsp. fabaria orpine
Hylotelephium telephium subsp. telephium orpine
Hymenocallis coronaria Carolina spiderlily
Hymenopappus filifolius fineleaf hymenopappus
Hymenophyllum wrightii Wright's filmy fern
Hymenoxys hooperii orange sneezeweed
Hymenoxys texana prairie dawn
Hyoscyamus niger black henbane
Hypericum adpressum creeping St. Johnswort
Hypericum androsaemum tutsan
Hypericum ascyron great St. Johnswort
Hypericum ascyron subsp. pyramidatum great St. Johnswort
Hypericum buckleyi Buckley's St. Johnswort
Hypericum calycinum Aaron's beard
Hypericum canadense Canada St. Johnswort
Hypericum cerastoides trailing St. John's-wort
Hypericum cumulicola
Hypericum densiflorum bushy St. Johnswort
Hypericum ellipticum ellipticleaf St. Johnswort
Hypericum frondosum cedar glade St. Johnswort
Hypericum gentianoides
Hypericum hypericoides
Hypericum hypericoides subsp. multicaule
Hypericum kalmianum Kalm's St. Johnwort
Hypericum lissophloeus
Hypericum majus greater St. Johnswort
Hypericum mutilum dwarf St. John's-wort
Hypericum mutilum subsp. boreale northern St. Johnswort
Hypericum mutilum subsp. mutilum dwarf St. Johnswort
Hypericum patulum goldencup St. Johnswort
Hypericum perforatum Klamathweed
Hypericum prolificum shrubby St. Johnswort
Hypericum punctatum spotted St. Johnswort
Hypericum sphaerocarpum roundfruit St. Johnswort
Hypochaeris glabra smooth cat's-ear
Hypochaeris radicata hairy cat's-ear
Hypopitys monotropa false beechdrops
Hypoxis hirsuta eastern yellow stargrass
Hyssopus officinalis hyssop