Hemlock, Canadian (spp.) Hemlock, Canadian 'Coles Prostrate'
Hemlock, Canadian 'Frosty' Hemlock, Canadian 'Lewisii'
Hemlock, Canadian 'Macrophylla' Hemlock, Canadian 'Sargentii'
Hemlock, Canadian Weeping Hemlock, Carolina
Hemlock, Eastern (spp.) Hemlock, Eastern 'Coles Prostrate'
Hemlock, Eastern 'Frosty' Hemlock, Eastern 'Lewisii'
Hemlock, Eastern 'Macrophylla' Hemlock, Eastern 'Sargentii'
Hemlock, Eastern Weeping Hen and Chicks: simulans
'Henry Hicks' Laurel Magnolia 'Henry's Garnet' Virginia Sweetspire
'Herbert' American Blueberry Hercule's Club
Hercules' Club Hesperaloe, Red
'Hessei' Cherry Plum 'Hessei' Cotoneaster: hybrid
'Heuros' Alumroot: Heuchera Hibiscus, Chinese (spp.)
Hibiscus, Chinese 'Hawaiian Salmon' Hibiscus, Chinese 'Jason'
Hibiscus, Chinese 'Snow Queen' Hibiscus, Hardy (spp.)
Hibiscus, Hardy 'Armande' Hibiscus, Hardy 'Azurri Blue Satin®'
Hibiscus, Hardy 'Blue Chiffon™' Hibiscus, Hardy 'Buc de Brabant'
Hibiscus, Hardy 'China Chiffon™' Hibiscus, Hardy 'Cicola'
Hibiscus, Hardy 'Floru(Violet Satin®)' Hibiscus, Hardy 'Lavender Chiffon™'
Hibiscus, Hardy 'Lil' Kim™' Hibiscus, Hardy 'Marina(Blue Satin®)'
Hibiscus, Hardy 'Minrosa (Rose Satin®)' Hibiscus, Hardy 'Pink Chiffon™'
Hibiscus, Hardy 'Pink Petticoat' Hibiscus, Hardy 'Purpureus Variegatus'
Hibiscus, Hardy 'Roseus Plenus' Hibiscus, Hardy 'Russian Violet'
Hibiscus, Hardy 'Sugar Tip®' Hibiscus, Hardy 'Totus Albus'
Hibiscus, Hardy 'White Chiffon™' Hibiscus, Hawaiian (spp.)
Hibiscus, Hawaiian 'Hawaiian Salmon' Hibiscus, Hawaiian 'Jason'
Hibiscus, Hawaiian 'Snow Queen' Hibiscus, Tropical (spp.)
Hibiscus, Tropical 'Hawaiian Salmon' Hibiscus, Tropical 'Jason'
Hibiscus, Tropical 'Snow Queen' Hickory, Shagbark (spp.)
Hickory, Shagbark 'Grainger' Hickory, Water
Hickory: ovata pubescens, Shagbark 'Hidden World' Tall Bearded German Iris
Highbush Blueberry (spp.) Highbush Blueberry 'Herbert'
Highbush Cranberry (spp.) Highbush Cranberry 'Wentworth'
'Hillspire' Eastern Red Cedar Himalaya Honeysuckle (spp.)
Himalaya Honeysuckle 'Golden Lanterns®' Himalaya Honeysuckle 'Purple Rain'
Hinkley's Yellow Columbine Hispaniolan Palmetto
'Hispida' Scotch Rose Hog Cranberry (spp.)
Hog Cranberry 'Massachusetts' Hog Cranberry 'Microphylla'
Hog Cranberry 'Point Reyes' Hog Cranberry 'Radiant'
Hog Gum