'Holmes Silver' Colorado Red Cedar 'Homestead' Hybrid Elm
Honduras Mahogany Honey Bells (spp.)
Honey Bells 'Sugar Shack®' Honey Berry
Honey Locust 'Elegantissima' Honey Mesquite
Honey Mesquite: glandulosa torreyana Honey Myrtle, Chenille
Honey Myrtle: nesophila, Showy Honey Palm
Honey-Myrtle, Desert Honeysuckle, Amur
Honeysuckle, Maak's Hong Kong Orchid Tree
'Hoopsii' Colorado Spruce Hoover's Manzanita
Hop Hornbeam Hop Hornbeam, American
Hop Hornbeam, Eastern Hop Tree, Common (spp.)
Hoptree (spp.) 'Horizontalis' Scotch Elm
Hornbeam Hornbeam Maple
Hornbeam, American Hornbeam, Common (spp.)
Hornbeam, Common 'Fastigiata' Hornbeam, European (spp.)
Hornbeam, European 'Fastigiata' Hornbeam, Japanese
Hornbeam: caroliniana, American Hornbeam: cordata
Hornbeam: laxiflora Horned Holly (spp.)
Horned Holly 'Burfordii' Horned Maple
'Hornibrookii' Norway Spruce Horoeka
Horsechestnut, California (spp.) Horsechestnut, California 'Canyon Pink'
Horsechestnut, Common (spp.) Horsechestnut, Common 'Memmingeri'
Horsechestnut, Common 'Sterile Horsechestnut' Horsechestnut, Common 'Umbraculifera'
Horsechestnut, European (spp.) Horsechestnut, European 'Memmingeri'
Horsechestnut, European 'Sterile Horsechestnut' Horsechestnut, European 'Umbraculifera'
Horsechestnut, Indian (spp.) Horsechestnut, Indian 'Sydney Pearce'
Horsechestnut, Japanese Horsechestnut, Red (spp.)
Horsechestnut, Red 'Briotii' Horsechestnut, Red 'Rubro-petiolata'
Horsechestnut, Ruby Red (spp.) Horsechestnut, Ruby Red 'Briotii'
Horsechestnut, Ruby Red 'Rubro-petiolata' Horsetail Tree
Horsetail Tree, Gray Houpu Magnolia
'Hoveyi' American Arborvitae 'Howard' American Holly
'Howard' American Sycamore Huangshan Magnolia
Huckleberry, Tree Huisache
Huizache Humata
'Hunter' Possum Haw Holly Huon Pine
Hurricane Palm Hybrid Elm 'Dodoens'
Hybrid Elm 'Frontier' Hybrid Elm 'Homestead'
Hybrid Elm 'Pioneer' Hybrid Elm 'Regal'
Hybrid Elm 'Sapporo Autumn Gold' Hybrid Elm 'Triumph™'
Hybrid Elm 'Urban' Hybrid Linden 'Crimean'
Hybrid Plane (spp.) Hybrid Plane 'Bloodgood'
Hybrid Plane 'Columbia' Hybrid Plane 'Liberty'
'Ibo nishiki' Japanese Maple 'Idahoensis' Locust
Idesia 'Idyllwild' Eastern Red Cedar
Ilang Ilang Illawarra Flame Tree
Illawarra Palm 'Illinois Hardy' Japanese Zelkova
Imodi Pine 'Imperial' Thornless Honey Locust
'Imperialis' European Alder