Holy Thistle Homalomena
'Home Fires' Creeping Phlox Homeria
'Homolosa' Bush Clover 'Honest Pleasure' Daylily
'Honesty' Money Plant Honesty (spp.)
Honesty 'Honesty' Honey Plant (spp.)
Honey Plant Variegated 'Honeybells' Hosta
Honeydew Sage 'Honeysong Purple' Stokes' Aster
Honeysuckle, Mexican Honeywort (spp.)
'Hong Chow Bowl' Sacred Lotus Hong Kong Lily
'Honky Tonk Blues' Tall Bearded German Iris Hoodia
Hoodia: gordonii Hoop & Petticoat Daffodil
Hop Goodenia Hop Marjoram (spp.)
Hop Marjoram 'Amargcus Dictamnus' Hop, Common Golden
Hop, Common 'Summer Shandy™' Hop, Common 'Variegatus'
Hop, European Golden Hop, European 'Summer Shandy™'
Hop, European 'Variegatus' Hop, False
'Hope' Florist's Chrysanthemum Hops, Ornamental Golden
Hops, Ornamental 'Summer Shandy™' Hops, Ornamental 'Variegatus'
'Horizon Coral Halo' Garden Petunia 'Horizon Yellow' Garden Petunia
Horn of Plenty (spp.) Horn of Plenty 'Flore Pleno'
Horned Pansy (spp.) Horned Pansy 'Alba Minor'
Horned Pansy 'Black Magic' Horned Pansy 'Jupiter'
Horned Pansy 'Penny Primrose' Horned Pansy 'Skippy XL Red-Gold'
Horned Pansy 'Sorbet Orange Duet' Horned Pansy 'Splendens'
Horned Poppy Horned Tulip
Horned Violet (spp.) Horned Violet 'Alba Minor'
Horned Violet 'Black Magic' Horned Violet 'Jupiter'
Horned Violet 'Penny Primrose' Horned Violet 'Skippy XL Red-Gold'
Horned Violet 'Sorbet Orange Duet' Horned Violet 'Splendens'
Horse Cane Horse Nettle
Horsefoot Horse-heal
Horsehoof Horsemint (spp.)
Horsemint 'Jacob Cline' Horsemint 'Marshal's Delight'
Horsemint 'Panorama' Horsemint: punctata
Horses Tail Horsetail
Horsetail Restio Horsetail, Common
Horsetail, Field Horsetail, Mini
Horsetail, Rough Horsetail: hyemale
'Hortensis' Japanese Aster