| H |
| Hackberry; Sugarberry, Celtis laevigata |
| Hairy melic grass, Melica ciliata |
| Hakone grass, Hakonechloa macro |
| Hamelin dwarf fountain grass, Panicum virgatum 'Hamelin' |
| Handel rose, Rosa 'MACha' |
| Hanesen's rose, Rosa 'Hanesen's' |
| Hansa rose, Rosa 'Hansa' |
| Happy Trails rose, Rosa 'JACcasp' |
| Hard fern; Deer fern, Blechnum spicant |
| Hardhack; Spirarea, Spiraea tomentosa |
| Hardy Yellow water lily, Nymphaea 'Hybrid Hardy Yellow' |
| Hare's-tail grass, Lagurus ovatus |
| Harebell, Southern; Panicled bellflower, Campanula divaricata |
| Harlequin flower, Sparaxis |
| Harlequin glorybower, Clerodendrum trichotomum |
| Harmony rose, Rosa 'Harmony' |
| Hatpins; Pipewort, Eriocaulon compressum |
| Hawkweed, Field; King devil, Hieracium pratense = Hieracium caespitosum |
| Hawkweed, Mouse-ear, Hieracium pilosella |
| Hawkweed, Mouse-ear, Pilosella officinarum |
| Hawkweed, Panicled, Hieracium paniculatum |
| Hawkweed, Rough, Hieracium scabrum |
| Hawthorn, Crataegus spp. |
| Hawthorn, Indian, Rhaphiolepis indica |
| Hawthorn, Indian, Rhaphiolepis x delacourii |
| Hawthorn, Washington, Crataegus phaenopyrum |
| Hawthorn, Washington, Crategus virdis 'Winter King' |
| Hawthorn, Yeddo, Rhaphiolepis umbellata |
| Hawthorne spp., Crataegus pinnatifida |
| Hawthorne, Down, Crataegus mollis |
| Hawthorne, English, Crataegus oxycantha = C. laevigata |
| Hay-scented fern; Boulder fern, Dennstaedtia punctiloba |
| Hazel, Buttercup winter, Corylopsis pauciflora |
| Hazel, Spike winter, Corylopsis spicata |
| Hazel, Willmott winter, Corylopsis willmottiae |
| Headliner rose, Rosa 'JACtu' |
| Heal-all, Prunella vulgaris |
| Heart O' Gold rose, Rosa 'WEKdykstra' |
| Hearts a'busting, Euonymus americanus |
| Hearts and honey vine, Ipomoea x multifida |
| Heather, False, Cuphea llavea |
| Heather, Scottish, Calluna vulgaris |
| Heavy Metal blue switch grass, Panicum virgatum 'Heavy Metal' |
| Hedge fern; Soft shield fern, Polystichum setiferum |
| Hedge-nettle, Smooth, Stachys tenuifolia |
| Heirloom rose, Rosa 'JACloom' |
| Heliopsis, Heliopsis helianthoides |
| Heliotrope, Creeping , Heliotropium amplexicaule |
| Heliotrope, Heliotropium arborescens |
| Hellebore, False; American white hellebore, Veratrum viride |
| Helleborus; Lenten rose; Christmas rose, Helleborus orientalis |
| Helmut Schmidt rose, Rosa 'KORbelma' |
| Helvola water lily; Yellow Pygmy water lily, Nymphaea 'Helvola' |
| Hemlock, Canadian, Tsuga canadensis |
| Hemlock, Carolina, Tsuga caroliniana |
| Hemlock, Jeddeloh Canadian, Tsuga canadensis 'Jeddeloh' |
| Hemlock, Water; Spotted cowbane, Cicuta maculata |
| Hen flower, Fritillaria meleagris |
| Henbit, Lamium amplexicaule |
| Henry Hudson rose, Rosa 'Henry Hudson' |
| Hepatica, Round-lobed, Hepatica americana = Hepatica noblis var. obtusa |
| Hepatica, Sharp-lobed, Hepatica acutiloba = Hepatica noblis var. acuta |
| Hepatica; Liverleaf; Liverwort, Hepatica americana |
| Hercules's club, Aralia spinosa |
| Hercules's club, Aralia spinosa |
| Heritage rose, Rosa 'AUSblush' |
| Hermosa rose, Rosa 'Hermosa' |
| Hero rose, Rosa 'AUShero' |
| Hibiscus, Chinese, Hibiscus rosa-sinensis |
| Hibiscus, Chinese, Hibiscus rosa-sinensis |
| Hibiscus, Diana; Diana rose-of-sharon, Hibiscus syriacus 'Diana' |
| Hibiscus, Red, Hibiscus coccineus |
| Hibiscus, Swamp, Hibiscus moschuetos |
| Hickory, Bitternut, Carya cordiformis |
| Hickory, Mockernut, Carya tomentosa |
| Hickory, Mocknut, Carya tomentosa |
| Hickory, Nutmeg, Carya myristicaeformis |
| Hickory, Nutmeg, Carya myristiciformis |
| Hickory, Pignut, Carya glabra |
| Hickory, Red, Carya ovalis |
| Hickory, Sand, Carya pallida |
| Hickory, Shagbark, Carya ovata |
| Hickory, White, Carya tomentosa |
| Highveld Sun rose, Rosa 'MORpapplay' |
| Himalayan cedar, Weeping, Cedrus deodara 'Pendula' |
| Himalayan spruce, Picea smithiana |
| Hime kan suga, Carex conica |
| Hinoke cypress, Dwarf, Chamaecyparis obtusa 'Nana' |
| Hinoke cypress, Gracillis, Chamaecyparis obtusa 'Gracillis' |
| Hinoke cypress, Reis dwarf, Chamaecyparis obtusa 'Reis Dwarf' |
| Hinoke cypress, Verdon, Chamaecyparis obtusa 'Verdoni' |
| Hinoki cypress, Coralliformus, Chamaecyparis obtusa 'Coralliformis' |
| Hinoki cypress, Ericoides, Chamaecyparis obtusa 'Ericoides' |
| Hinoki cypress, Golden, Chamaecyparis obtusa 'Crippsii' |
| Hinoki cypress, Yellow, Chamaecyparis obtusa 'Confucius' |
| Hinoki falsecypress, Chamaecypari obtusa |
| Hobblebush, Viburnum alnifolium |
| Hobblebush; Witch-hobble, Viburnum alnifolium |
| Holly, American, Ilex opaca |
| Holly, Bordeaux yaupon, Ilex vomitoria 'Bordeaux' |
| Holly, Burford, Ilex cornuta 'Burfordii' |
| Holly, Carissa, Ilex cornuta 'Carissa' |
| Holly, Carolina Sentinel, Ilex x 'Carolina Sentinel' |
| Holly, Chinese, Ilex cornuta |
| Holly, Chinese, Ilex cornuta |
| Holly, Claredon Spreading American, Ilex opaca 'Claredon Spreading' |
| Holly, Convexa Japanese, Ilex crenata 'Convexa' |
| Holly, D' Or Chinese, Ilex cornuta 'D' Or' |
| Holly, D'Or Chinese, Ilex cornuta 'D'Or' |
| Holly, Dahoon, Ilex cassine |
| Holly, Decidious, Ilex hybrids |
| Holly, Dragon Lady, Ilex 'Dragon Lady' |
| Holly, Dwarf horned, Ilex cornuta 'Rotunda' |
| Holly, Dwarf yaupon, Ilex vomitoria 'Nana' |
| Holly, Emily Brumer, Ilex x 'Emily Brumer' |
| Holly, Emily Brumer, Ilex x 'Emily Brumer' |
| Holly, English, Ilex aquifolium |
| Holly, False, Osmanthus heterophyllus |
| Holly, Finetooth, Ilex serrata |
| Holly, Foster's, Ilex x attenuata 'Fosteri' |
| Holly, Helleri Japanese, Ilex crenata 'Helleri' |
| Holly, Hetz's Japanese, Ilex crenata 'Hetzii' |
| Holly, Japanese, Ilex crenata |
| Holly, Longstalk, Ilex pedunculosa |
| Holly, Lusterleaf, Ilex latifolia |
| Holly, Lusterleaf, Ilex latifolia |
| Holly, Martha Berry, Ilex x 'Martha Berry' |
| Holly, Martha Berry, Ilex x 'Martha Berry' |
| Holly, Maryland Dwarf American, Ilex opaca 'Maryland Dwarf' |
| Holly, Meserve hybrid, Ilex x meserveae |
| Holly, Mountain, Ilex montana |
| Holly, Myrtle leaved, Ilex cassine |
| Holly, Nellie R. Stevens, Ilex x 'Nellie R. Stevens' |
| Holly, Nellie Stevens, Ilex 'Nellie R. Stevens' |
| Holly, O'Spring Chinese, Ilex cornuta 'O'Spring' |
| Holly, Oregon grape, Mahonia aquifolium |
| Holly, Perny, Ilex pernyi |
| Holly, Red hybrid, Ilex 'Red Hollies' |
| Holly, Savannah, Ilex x 'Savannah' |
| Holly, Scepter, Ilex x 'Scepter' |
| Holly, Stokes Dwarf yaupon, Ilex vomitoria 'Stokes Dwarf' |
| Holly, Sundance, Ilex decidua 'Sundance' |
| Holly, Weeping yaupon, Ilex vomitoria f. pendula |
| Holly, Will Fleming yaupon, Ilex vomioria 'Will Fleming' |
| Holly, Winterberry; Black alder, Ilex verticillata |
| Holly, Yaupon, Ilex vomitoria |
| Hollyhocks, Alcea rosea |
| Holy rose, Rosa 'Holy Rose' |
| Honey Bouquet rose, Rosa 'JACyimp' |
| Honeylocust, Gleditsia triacanthos |
| Honeylocust, Thornless common, Gleditsia triocanthus var. inernis |
| Honeysuckle, Boxleaf, Lonicera nitida |
| Honeysuckle, Brown's, Lonicera x brownii |
| Honeysuckle, Coral, Lonicera sempervirens |
| Honeysuckle, European fly, Lonicera xyiosteum |
| Honeysuckle, Goldflame, Lonicera x heckrottii |
| Honeysuckle, Japanese, Lonicera japonica |
| Honeysuckle, Lonicera alseuosmoides |
| Honeysuckle, Lonicera periclymenum |
| Honeysuckle, Privet, Lonicera pileata |
| Honeysuckle, Redgold, Lonicera x tellmanniana |
| Honeysuckle, Scarlet trumpet, Lonicera x brownii |
| Honeysuckle, Southern bush, Diervilla sessilifolia |
| Honeysuckle, Swamp, Rhododendron viscosum |
| Honeysuckle, Tatarian, Lonicera tatarica |
| Honeysuckle, Trumpet, Lonicera sempervirens |
| Honeysuckle, Winter, Lonicera fragrantissima |
| Honeysuckle; Coral honeysuckle, Lonicera sempervirens |
| Hops, Common, Humulus lupulus |
| Hoptree, Ptelea trifoliata |
| Horehound, Marrubium vulgare |
| Horn-of-plenty, Datura metal |
| Hornbeam, American, Carpinus caroliniana |
| Hornbeam, European, Carpinus betulus |
| Hornbeam, Heartleaf, Carpinus cordata |
| Hornbeam, Hop, Ostrya virginiana |
| Hornbeam, Japanese, Carpinus japonica |
| Horse-nettle, Solanum carolinense |
| Horsechestnut, Common, Aesculus hippocastamon |
| Horsechestnut, Red, Aesculus x carnea |
| Horsemint, Spotted, Monarda punctata |
| Horsesugar, Symplocos tinctoria |
| Horsetail, Dwarf, Equisetum scorpoides |
| Horsetail, Equisetum hyemale |
| Hosoba kan suge, Carex morrowii var. temnolepsis (Carex temnolepis) |
| Hosta, Hosta spp. |
| Hot Tamale rose, Rosa 'JACpoy' |
| Hound's tongue, Cynoglossum amabile |
| Houston Coventry Cathedral rose, Rosa 'Houston Coventry Cathedral' |
| Houstonia, Large; Woodland bluets, Houstonia purpurea |
| Houstonia, Houstonia spp. |
| Hugs N Kisses rose, Rosa 'JACiraps' |
| Hyacinth bean, Dolichos lablab |
| Hyacinth bletilla, Bletilla striata |
| Hyacinth, Wild, Brodiaea = Triteleia |
| Hyacinth, Wild, Camassia |
| Hyacinth, Wild, Camassia cusickii, C. esculenta |
| Hyacinth, Wild; Eastern camas, Camassia scilloides |
| Hyacinths, Dutch, Hyacinthus orientalis |
| Hyacinths, Wood, Scilla campanulata (Endymion, Hyacinthoides) |
| Hybrid pinks, Dianthus chinensis x barbatus |
| Hydrangea vine, Japanese, Schizophragma hydrangeoides |
| Hydrangea, Annabelle, Hydrangea arborescens 'Annabelle' |
| Hydrangea, Bigleaf, Hydrangea macrophylla |
| Hydrangea, Climbing, Decumaria barbara |
| Hydrangea, Climbing, Hydrangea anomala subsp. petiolaris |
| Hydrangea, Hydrangea xanthoneula |
| Hydrangea, Oakleaf, Hydrangea quercifolia |
| Hydrangea, Oakleaf, Hydrangea quercifolia |
| Hydrangea, Peegee, Hydrangea paniculata |
| Hydrangea, Smooth, Hydrangea arborescens |
| Hydrangea, Smooth; Wild hydrangea, Hydrangea arborescens |
| Hydrangea-vine, Chinese, Schizophragma integrifolium |
| Hypericum, Tricolor, Hypericum 'Tricolor' |
| Hyssop, Agastache foeniculum |
| Hyssop, Hedge, Gratiola viscidula |
| Hyssop, Hyssopus officinalis |