Holy Thistle 'Hombre' Rose
Honey Myrtle, Chenille Honeysuckle, Black Twinberry
Honeysuckle, Boxleaf 'Baggesen's Gold' Honeysuckle, Boxleaf 'Briloni (Edmee Gold)'
Honeysuckle, Bush 'Butterfly' Honeysuckle, Chuparosa
Honeysuckle, Common 'Scentsation' Honeysuckle, European 'Scentsation'
Honeysuckle, Florida Honeysuckle, Himalaya (spp.)
Honeysuckle, Himalaya 'Golden Lanterns®' Honeysuckle, Himalaya 'Purple Rain'
Honeysuckle, Japanese (spp.) Honeysuckle, Japanese 'Hall's'
Honeysuckle, Japanese 'Purpurea' Honeysuckle, Southern Bush 'Butterfly'
Honeysuckle, Trumpet (spp.) Honeysuckle, Trumpet 'John Clayton'
Honeysuckle, Winter Honeysuckle: sempervirens, Coral (spp.)
Honeysuckle: sempervirens, Coral 'John Clayton' Honeywort (spp.)
'Honky Tonk Blues' Tall Bearded German Iris 'Hoopsii' Colorado Spruce
Hop Hornbeam, American Hop Hornbeam, Eastern
Hop Tree, Common (spp.) Hop Tree, Common Golden
Hoptree (spp.) Hoptree Golden
Hornbeam, American Hornbeam: caroliniana, American
Horned Holly 'Burfordii Nana' Horsemint (spp.)
Horsemint 'Jacob Cline' Horsemint 'Marshal's Delight'
Horsemint 'Panorama' Horsemint: punctata
Houseleek: pomelii 'Hoveyi' American Arborvitae
'Howard' American Holly 'Howard' American Sycamore
'Howard McMinn' Sonoma Manzanita Huckleberry, Box
Huckleberry, Californian Huckleberry, Evergreen
Huckleberry, Florist's Huckleberry, Shot
Huckleberry, Tree Huisache
Huizache 'Humdinger' Rose
Humming Bird's Trumpet (spp.) Hummingbird Bush
Hummingbird Mint 'Golden Jubilee' Hummingbird Sage 'Lady in Red'
Hummingbird Trumpet Hummingbird Yucca
'Hunter' Possum Haw Holly 'Huron Sunrise' Maiden Grass
'Husker Red' Foxglove Penstemon Hybrid Clematis 'Sweet Summer Love'
Hyssop Hyssop, Anise 'Golden Jubilee'
Hyssop, Blue Giant 'Golden Jubilee' Hyssop, Fragrant Giant 'Golden Jubilee'
Hyssop, Giant 'Blue Fortune' Hyssop, Giant 'Pink Panther'
Hyssop, Giant 'Tutti Fruitti' Hyssop, Mexican 'Blue Fortune'
Hyssop, Mexican 'Pink Panther' Hyssop, Mexican 'Tutti Fruitti'
Hyssop, Rock Anise Hyssop, Sunset
'Ice Ballet' Swamp Milkweed 'Ice Carnival' Daylily
'Idyllwild' Eastern Red Cedar 'Ikarus' Common Sunflower
Illyrian Iris 'Immortality' Tall Bearded German Iris
'Imperial Star' Artichoke 'Improved Rugen' Wild Strawberry
Indian Bayou Powdery Thalia Indian Cress 'Whirlybird Cream'
Indian Hawthorn 'Olivia' 'Indian Maiden' American Holly
Indian Mallow, Red Vein 'Gold Dust' Indian Paintbrush
'Indian Summer' Rose 'Indian Summer' Sweet Corn
Indian Turnip Indigo, Blue False
Indigo, Blue Wild Indigoberry, White
'Inermis Compacta' English Hawthorn: monogyna 'Ingrid Bergman' Rose
Ink Bush