Hard Maple (spp.) Hard Maple 'Ann Rutledge'
Hard Maple 'Arrowhead' Hard Maple 'Celebration'
Hard Maple 'Coleman' Hard Maple 'Commemoration'
Hard Maple 'Eagle Claw' Hard Maple 'Endowment'
Hard Maple 'Fairview' Hard Maple 'Globosum'
Hard Maple 'Goldspire' Hard Maple 'Legacy'
Hard Maple 'Newton Sentry' Hard Maple 'Seneca Chief'
Hard Maple 'Skybound' Hard Maple 'Sweet Shadow'
Hard Maple 'Temple's Upright' Hardy Bamboo Palm
Hardy Catalpa (spp.) Hardy Catalpa 'Pulveralenta'
Hardy Orange (spp.) Hardy Rubber Tree
Harlequin Maple (spp.) Harlequin Maple 'Alberta Park'
Harlequin Maple 'Almira' Harlequin Maple 'Charles F. Irish'
Harlequin Maple 'Cleveland' Harlequin Maple 'Columnare'
Harlequin Maple 'Crimson King' Harlequin Maple 'Crimson Sentry'
Harlequin Maple 'Drummondii' Harlequin Maple 'Easy Street™'
Harlequin Maple 'Emerald Lustre™' Harlequin Maple 'Erectum'
Harlequin Maple 'Globosum' Harlequin Maple 'Goldsworth Purple'
Harlequin Maple 'Greenlace' Harlequin Maple 'Maculatum'
Harlequin Maple 'Olmsted' Harlequin Maple 'Royal Red'
Harlequin Maple 'Schwedleri' Harlequin Maple 'Summershade'
Harlequin Maple 'Superform' Harlequin Maple 'Undulatum'
'Harusume' Japanese Maple 'Harvest Gold™' Flowering Crabapple
'Hasse' Southern Magnolia Hat Palm
Hat Tree 'Hatfieldii' Anglojapanese Yew
Hawaiian Hibiscus 'TieDye Wind' Hawthorn
Hawthorn, Apple Hawthorn, Dotted
Hawthorn, Downy Hawthorn, English (spp.)
Hawthorn, English 'Paul's Scarlet' Hawthorn, Green 'Winter King'
Hawthorn, May Hawthorn, Round-leaf
Hawthorn, Russian Hawthorn, Southern 'Winter King'
Hawthorn, Washington Hawthorn, Yedda
Hawthorn: monogyna, English (spp.) Hawthorn: monogyna, English 'Inermis Compacta'
Hazel Hazel, Turkish
Hazelnut, American Hazelnut: americana
Heartleaf Manzanita 'Hearts of Gold' Eastern Redbud
Hedge Maple (spp.) Hedge Maple 'Carnival'
Hedge Maple 'Postelense' Hedge Maple 'Tauricum'
Hedge Maple: campestre austriacum Hedgehog Fir (spp.)
Hedgehog Fir Blue Hemiptelea
Hemlock, Canadian (spp.) Hemlock, Canadian 'Bennett'
Hemlock, Canadian 'Frosty' Hemlock, Canadian 'Macrophylla'
Hemlock, Canadian Weeping Hemlock, Carolina
Hemlock, Eastern (spp.) Hemlock, Eastern 'Bennett'
Hemlock, Eastern 'Frosty' Hemlock, Eastern 'Macrophylla'
Hemlock, Eastern Weeping Hemlock, Himalayan
Hemlock, Mountain Hemlock, Western
Hemsley's Dogwood Henry Anise
'Henry Hicks' Laurel Magnolia Henry Tanbark Oak
Henry's Lime Henry's Linden