Honey Bells (spp.) Honey Bells 'Sugar Shack®'
Honey Locust 'Elegantissima' Honey Mesquite
Honey Mesquite: glandulosa torreyana 'Honeysong Purple' Stokes' Aster
Honeysuckle, Black Twinberry Honeysuckle, Bush
Honeysuckle, Bush 'Butterfly' Honeysuckle, Chuparosa
Honeysuckle, Desert Honeysuckle, Florida
Honeysuckle, Georgia Bush 'Summer Stars™' Honeysuckle, Southern Bush 'Butterfly'
Honeysuckle, Thurber's Desert Honeysuckle, Trumpet (spp.)
Honeysuckle: sempervirens, Coral (spp.) 'Hoopsii' Colorado Spruce
Hop Hornbeam, American Hop Hornbeam, Eastern
Hop Tree, Common (spp.) Hop Tree, Common Golden
Hop, False Hopbush (spp.)
Hopseed Bush (spp.) Hoptree (spp.)
Hoptree Golden Horizontal Juniper (spp.)
Horizontal Juniper 'Alpina' Horizontal Juniper 'Bar Harbor'
Horizontal Juniper Blue Horizontal Juniper 'Blue Acres'
Horizontal Juniper 'Blue Rug' Horizontal Juniper 'Douglasii'
Horizontal Juniper 'Dunvegan Blue' Horizontal Juniper 'Emerald Spreader'
Horizontal Juniper 'Hegedus (Good Vibrations® Gold)' Horizontal Juniper 'Hughes'
Horizontal Juniper 'Livida' Horizontal Juniper 'Plumosa'
Horizontal Juniper 'Plumosa Compacta' Horizontal Juniper 'Prince of Wales'
Horizontal Juniper 'Turqouise Spreader' Horizontal Juniper Variegated
'Horizontalis' Colorado Red Cedar Hornbeam, American
Hornbeam: caroliniana, American 'Hornibrookii' Common Juniper
Horse Cane Horse Nettle
Horsechestnut, California (spp.) Horsefoot
Horsehoof Horsemint (spp.)
Horsemint 'Jacob Cline' Horsemint 'Marshal's Delight'
Horsemint 'Panorama' Horsemint: punctata
Horses Tail Horsetail, Common
Horsetail, Field Horsetail, Mini
Horsetail, Rough Horsetail: hyemale
'Hot Lips' Pink Turtlehead Hot Water Plant
'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
'Hughes' Creeping Juniper Huisache
Huizache Humming Bird's Trumpet (spp.)
Hummingbird Bush Hummingbird Flower
Hummingbird Mint 'Golden Jubilee' Hummingbird Sage (spp.)
Hummingbird Sage 'Lady in Red' 'Hummingbird' Summer Sweet
Hummingbird Trumpet Hummingbird Yucca
'Hunter' Possum Haw Holly 'Huntsman' Large Fothergilla
Huntsman's Cup Huntsman's Horn 'Peaches & Green'
Hurricane Plant 'Hurricane Point' Carmel Creeper
Husk Tomato, Mexican 'Husker Red' Foxglove Penstemon
'Hybrid Mix' Lewisia Hybrid Spiderwort (spp.)