Hemlock, Canadian (spp.) Hemlock, Canadian 'Bennett'
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 'Bennett' Hemlock, Eastern 'Coles Prostrate'
Hemlock, Eastern 'Frosty' Hemlock, Eastern 'Lewisii'
Hemlock, Eastern 'Macrophylla' Hemlock, Eastern 'Sargentii'
Hemlock, Eastern Weeping Hemlock, Himalayan
Hemlock, Mountain Hemlock, Poison
Hemlock, Western Hemp Agrimony
Hemp Vine, Climbing Hemp, Bowstring
Hemp, Bowstring 'Patula' Hemp, Bowstring 'Pulchra'
Hemp, Ceylon Bowstring Hemp, Mauritius 'Mediopicta'
Hemp, New Zealand (spp.) Hemp, New Zealand 'Apricot Queen'
Hemp, New Zealand 'Dazzler' Hemp, New Zealand 'Pink Stripe'
Hemp, New Zealand 'Purpureum' Hemp, New Zealand 'Rainbow Sunrise (Maori Queen)'
Hemp, New Zealand 'Surfer' Hemp, Somali
Hempweed, Climbing Hemsley's Dogwood
Hen and Chickens Fern Hen and Chickens Houseleek
Hen and Chickens (spp.) Hen and Chickens 'Cleveland Morgan'
Hen and Chickens 'Violaceum' Hen and Chicks
Hen and Chicks 'Red Edge' Hen and Chicks, Cobweb
Hen and Chicks: colorata Hen and Chicks: derenbergii
Hen and Chicks: dowingo Hen and Chicks: elegans
Hen and Chicks: flus Hen and Chicks: imbricatahybrid
Hen and Chicks: peacockii Hen and Chicks: potosina
Hen and Chicks: pulidonis Hen and Chicks: secunda glauca
Hen and Chicks: secunda pumila Hen and Chicks: simulans
Henbit Dead Nettle 'Hendersonii' Golden Trumpet Vine
Henderson's Shooting Star 'Hennie Graafland' Dwarf Astilbe
Henry Anise 'Henry Eilers' Sweet Coneflower
'Henry Hicks' Laurel Magnolia 'Henry III' New York Aster
Henry Tanbark Oak 'Henryi' Anglojapanese Yew
'Henry's Garnet' Virginia Sweetspire Henry's Lily
Henry's Lime Henry's Linden
Hens and Chicks 'Kalinda' Hens and Chicks, Mexican
Hens and Chicks: canariense Hens and Chicks: pumilum
Hepatica Hepatica, Round Lobed
Hepatica, Sharp-lobed 'Hephestos' Japanese Tree Peony
Herb of Grace (spp.) Herb of Grace 'Blue Showers'
Herb of Grace 'Snowflake' Herb of Grace: graveolens (spp.)
Herb Peter (spp.) Herb, Felon (spp.)
Herb, Felon 'Oriental Limelight' 'Herbal Rose' Sweet Scented Geranium
'Herbert' American Blueberry 'Herbstsonne' Shiny Coneflower
Hercule's Club Hercules' Club
'Heritage' Southern Live Oak 'Herman von Schpenck' American Boxwood
'Herman's Pride' Yellow Archangel 'Hermine' Waterlily
Heron's Bill Geranium White Heron's Bill 'Roseum'
Heron's Bill 'Stork Bill Pink' 'Heronswood Mist' Foamflower: Tiarella