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Hacquetia epipactis AGM
Hakonechloa macra 'Aureola' AGM
Hakonechloa macra 'Nicolas'
Hedysarum coronarium
Helenium autumnale
Helenium 'Butterpat' AGM
Helenium 'Flammendes Käthchen'
Helenium 'Gartensonne' AGM
Helenium 'Indianersommer'
Helenium 'Kanaria'
Helenium 'Königstiger'
Helenium 'Moerheim Beauty' AGM
Helenium 'Red Jewel'
Helenium 'Rubinzwerg' AGM
Helenium 'Sahin's Early Flowerer' AGM
Helenium 'Waltraut' AGM
Helenium 'Wyndley'
Helenium 'Zimbelstern'
Helianthemum 'Ben Hope'
Helianthus 'Capenoch Star' AGM
Helianthus 'Lemon Queen' AGM
Helianthus 'Loddon Gold' AGM
Helianthus 'Monarch' AGM
Helianthus salicifolius
Heliopsis helianthoides var. scabra 'Benzinggold' AGM
Heliopsis helianthoides var. scabra 'Sommersonne'
Heliopsis helianthoides var. scabra 'Summer Nights'
Heliotropium arborescens 'Gatton Park'
Helleborus argutifolius AGM
Helleborus niger AGM
Helleborus x ericsmithii 'Bob's Best'
Helleborus x hybridus
Helleborus x hybridus 'Blue Lady' (Lady Series)
Helleborus x hybridus 'Pink Lady' (Lady Series)
Helleborus x hybridus 'Red Lady'
Helleborus x hybridus 'White Lady' (Lady Series)
Helleborus x hybridus 'Yellow Lady' (Lady Series)
Hemerocallis altissima
Hemerocallis 'Awesome Blossom'
Hemerocallis 'Baby Talk'
Hemerocallis 'Bonanza'
Hemerocallis 'Canary Glow'
Hemerocallis 'Cathy's Sunset'
Hemerocallis 'Cherry Cheeks'
Hemerocallis 'Chicago Royal Robe'
Hemerocallis 'Christmas Is'
Hemerocallis 'Crimson Pirate'
Hemerocallis 'Daring Deception'
Hemerocallis 'Diamond Dust'
Hemerocallis 'Double Firecracker' (d)
Hemerocallis 'Edge Ahead'
Hemerocallis 'Eleonor'
Hemerocallis 'Entrapment'
Hemerocallis 'First Formal'
Hemerocallis 'Gentle Shepherd'
Hemerocallis 'Light Years Away'
Hemerocallis middendorffii
Hemerocallis 'Netsuke'
Hemerocallis 'Pink Damask' AGM
Hemerocallis 'Pink Prelude'
Hemerocallis 'Red Rum'
Hemerocallis 'Serenity Morgan'
Hemerocallis 'Snowy Apparition'
Hemerocallis 'Stafford'
Hemerocallis 'Stella de Oro'
Hemerocallis 'Whichford' AGM
Hepatica nobilis AGM
Hepatica transsilvanica AGM
Hermodactylus tuberosus
Hesperis matronalis var. albiflora
Heuchera 'Amethyst Myst'
Heuchera 'Beauty Colour'
Heuchera 'Chocolate Ruffles' (PBR)
Heuchera CRÈME BRÛLÉE 'Tnheu041' (Dolce Series)
(other names: Heuchera 'Dolce Crème Brûlée' (syn), Heuchera 'TNHEU041' (accepted))
Heuchera cylindrica 'Greenfinch'
Heuchera 'Dark Beauty' (PBR)
Heuchera 'Electra'
Heuchera 'Fire Chief'
Heuchera 'Green Spice'
Heuchera 'Midnight Rose'
Heuchera 'Mint Frost' (PBR)
Heuchera 'Mocha' (PBR)
Heuchera 'Obsidian' (PBR)
Heuchera 'Peach Flambé' (PBR)
Heuchera 'Pinot Noir'
Heuchera 'Pistache'
Heuchera 'Pluie de Feu'
Heuchera 'Prince of Silver'
Heuchera 'Purple Petticoats' AGM
Heuchera 'Rave On' (PBR)
Heuchera 'Swirling Fantasy' (PBR)
Heuchera 'Tiramisu'
Heuchera villosa 'Palace Purple'
Heuchers 'Berry Smoothie'
Hosta (Tardiana Group) 'Hadspen Blue'
Hosta (Tardiana Group) 'June' (PBR) (v) AGM
Hosta (Tardiana Group) 'June Fever' (PBR)
Hosta 'Aphrodite' (plantaginea) (d)
Hosta 'August Moon'
Hosta 'Big Daddy' (sieboldiana hybrid) (v)
Hosta 'Blue Cadet'
Hosta 'Blue Umbrellas' (sieboldiana hybrid)
Hosta 'Brim Cup' (v)
Hosta 'Cherry Berry' (v)
Hosta 'Dancing in the Rain' (v)
Hosta 'Eskimo Pie' (v)
Hosta 'Fire and Ice' (v)
Hosta 'Fireworks' (v)
Hosta 'Francee' (fortunei) (v) AGM
Hosta 'Frances Williams' (sieboldiana) (v) AGM
Hosta 'Gold Regal'
Hosta 'Gold Standard' (fortunei) (v)
Hosta 'Golden Meadows' (PBR) (sieboldiana)
Hosta 'Great Expectations' (sieboldiana) (v)
Hosta 'Jade Cascade'
Hosta 'Krossa Regal' AGM
Hosta 'Patriot' (v)
Hosta 'Pearl Lake'
Hosta plantaginea var. japonica AGM
Hosta 'Remember Me' (PBR)
Hosta 'Royal Standard' AGM
Hosta sieboldiana var. elegans AGM
Hosta 'Sum and Substance' AGM
Hosta 'Sun Power'
Hosta 'Whirlwind' (fortunei) (v)
Hosta 'Wide Brim' (v) AGM
Houttuynia cordata 'Boo-Boo' (v)
Houttuynia cordata 'Chameleon' (v)
Houttuynia cordata 'Flame' (v)
Houttuynia cordata 'Joker's Gold'
Hyacinthoides non-scripta
Hypericum cerastioides
Hypericum 'Rowallane' AGM
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