Hedge Bamboo (spp.) Hedge Bamboo 'Rivereorum'
Hedge Bamboo 'Silver Stripe' Hedge Coneflower (spp.)
Hedge Coneflower 'Bright Star' Hedge Coneflower 'Kim's Knee High'
Hedge Coneflower 'Kim's Mophead' Hedge Coneflower 'Magnus'
Hedge Coneflower 'Primadonna® Rose' Hedge Coneflower 'Ruby Star'
Hedge Coneflower 'Stewarts Pink' Hedge Coneflower 'Stewarts Red'
Hedge Coneflower 'White King' Hedge Coneflower 'White Swan'
Hedge Nettle 'Robusta' Hedge Nettle, White
Hedge Nettle, Whitestem Hedgehog Agave
Hedgehog Cactus 'Heidi' Columbine
'Heidi' Common Yarrow 'Helen von Stein' Lamb's Ears
Helen's Flower 'Bruno' Helen's Flower 'Coppelia'
Helen's Flower 'Mardi Gras' Helen's Flower 'Moerheim Beauty'
Heliopsis, Sunflower (spp.) Heliopsis, Sunflower 'Ballerina'
Heliopsis, Sunflower 'Summer Sun' 'Helios' Clematis: tangutica
'Heliot' Tickseed Coreopsis Heliotrope (spp.)
Heliotrope 'Atlantis' Heliotrope 'Marine'
Heliotrope: amplexicaule Hellebore (spp.)
Hellebore 'Gold Finch' Hellebore 'Kingston Cardinal'
Hellebore 'Snow Bunting' Hellebore, Corsican
Hellebore, False Hellebore, Green
Hellebore, Stinking (spp.) Hellebore, Stinking Variegated
Hellebore: sterniihybrid (spp.) Hellebore: sterniihybrid 'Ashwood Garden Strain'
Hellebore: sterniihybrid 'Blackthorn' Hellebore: sterniihybrid 'Boughton Beauty'
Hellebore: torquatus 'Hello Yellow' Butterfly Weed: tuberosa
Helmet Flower Helmet Flower: suffrutescens
'Helvola' Waterlily Hemigraphis 'Exotica'
Hemlock, Poison Hemp Agrimony
Hemp Vine, Climbing 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
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
Henderson's Shooting Star 'Hennie Graafland' Dwarf Astilbe
'Henry Eilers' Sweet Coneflower 'Henry III' New York Aster
Henry's Lily Hens and Chicks 'Kalinda'
Hens and Chicks, Mexican Hens and Chicks: canariense
Hens and Chicks: pumilum Hepatica
Hepatica, Round Lobed Hepatica, Sharp-lobed