'Hephestos' Japanese Tree Peony Herb of Grace (spp.)
Herb of Grace 'Blue Showers' Herb of Grace 'Snowflake'
Herb of Grace: graveolens (spp.) Herb Peter (spp.)
Herb, Felon (spp.) Herb, Felon 'Oriental Limelight'
'Herbal Rose' Sweet Scented Geranium 'Herbstsonne' Shiny Coneflower
'Herman's Pride' Yellow Archangel 'Hermine' Waterlily
Heron's Bill Geranium White Heron's Bill 'Roseum'
Heron's Bill 'Stork Bill Pink' 'Heronswood Mist' Foamflower: Tiarella
'Herrenhausen' Ornamental Oregano 'Herringbone Plant' Prayer Plant
Hesperaloe, Giant Hesperaloe, Night Blooming
Hesperaloe, Red 'Hesperus' Daylily
'Heuros' Alumroot: Heuchera 'HGC Green Corsican' Christmas Rose
'HGC Jacob' Christmas Rose 'HGC Josef Lemper' Christmas Rose
'HGC Silvermoon' Winter Rose 'Hi Ho Silver' Hosta
Hibiscus, Red Leaf 'Coppertone (Red Shield)' Hibiscus, Red Leaf 'Jungle Red'
Hibiscus, Sweet 'Hidcote Pink' Bearded Tongue: Penstemon
Hidden Lily Ginger (spp.) Hidden Lily Ginger 'Emperor'
Hidden Lily Ginger: roscoeana (spp.) Hidden Lily Ginger: roscoeana 'White Flame'
Hidden Lily Ginger: zedoaria 'Hidden World' Tall Bearded German Iris
'High Contrast' Lungwort: hybrid High Mallow 'Zebrina'
'Highland Cream' Creeping Thyme 'Hillside Pink Sheffield' Florist's Chrysanthemum
'Hilo Beauty' Elephant's Ear: Alocasia 'Hilo Holiday' Rex Begonia
Himalayan Blue Poppy (spp.) Himalayan Blue Poppy 'Lingholm'
Himalayan Fleece Flower (spp.) Himalayan Fleece Flower 'Border Jewel'
Himalayan Foxtail Lily Himalayan Gloxinia
Himalayan Mint Shrub 'Hime-kan-suge' Sedge
Hindu Datura 'Flore Pleno' Hindu Rope Plant (spp.)
Hindu Rope Plant Variegated Hinkley's Yellow Columbine
'Hobbit' Fescue 'Hoffman's Red' Border Pink
'Hoki' Japanese Tree Peony Holly Fern (spp.)
Holly Fern Variegated Holly Fern: falcatum
Holly Fern: nepalense 'Holly Herrema' Daylily
Holly, Alpine Sea (spp.) Holly, Flat Sea (spp.)
Holly, Flat Sea 'Blaukappe' Holly, Flat Sea 'Jade Frost'
Holly, Mediterranean Sea Holly, Moroccan Sea
Holly, Sea 'Sapphire Blue' Holly, Sea (spp.)
Holly: maritimum, Sea (spp.) Holly: minor, English (spp.)
Holly: minor, English 'Bowle's Variety' Holly: minor, English 'Illumination'
Holly: minor, English 'Sterling Silver' Holly: minor, English Variegated
Holly: tripartitumhybrid, Sea Holly: venustum, Sea
Hollyhock Mallow (spp.) Hollyhock Mallow 'Fastigiata'
Hollyhock (spp.) Hollyhock 'Summer Memories'
Hollyhock 'Chater's Double' Hollyhock 'Creme de Cassis'
Hollyhock 'Peaches 'n' Dreams' Hollyhock 'Queeny Purple'
Hollyhock 'Summer Carnival' Hollyhock 'The Watchman'
Hollyhock, Antwerp Hollyhock, Desert
Hollyhock, French 'Zebrina' Hollyhock: officinalis
Hollyhock: rugosa 'Holly's Honey' Hosta
Homalomena 'Home Fires' Creeping Phlox
Homeria 'Homolosa' Bush Clover