| Gaillardia 'Dazzler' | Blanket Flower |
| Gaillardia 'Fanfare' | Blanket Flower |
| Gaillardia x grandiflora 'Burgundy' | Blanket Flower |
| Gaillardia x grandiflora 'Goblin' | Blanket Flower |
| Gaillardia x grandiflora 'Golden Goblin' | Blanket Flower |
| Galax urceolata | Galax |
| Galium odoratum | Sweet Woodruff |
| Gardenia jasminoides ‘Kleim’s Hardy’ | Gardenia, Hardy |
| Gaultheria procumbens | Wintergreen |
| Gaultheria shallon | Salal |
| Gaura l. 'Corrie's Gold' | Wand Flower |
| Gaura l. 'Dauphine' | Wand Flower |
| Gaura l. hyb. 'Perky Pink' | Wand Flower |
| Gaura l. 'Passionate Pink' | Wand Flower |
| Gaura l. 'Pink Fountain' | Wand Flower |
| Gaura l. 'Siskiyou Pink' | Wand Flower |
| Gaura l. 'Whirling Butterflies' | Wand Flower |
| Gaura l. 'White Fountain' | Wand Flower |
| Gazania linearis 'Colorado Gold' | Treasure Flower |
| Gentiana makino 'Royal Blue' | Gentiana |
| Geranium cin. 'Ballerina' | Geranium, Hardy |
| Geranium 'Johnson's Blue' | Geranium, Hardy |
| Geranium 'Johnson's Blue Elite' | Geranium, Hardy |
| Geranium ph. 'Samobor' | Geranium, Hardy |
| Geranium ph. var. 'Purpureum' | Geranium, Hardy |
| Geranium prat. 'Midnight Reiter' | Geranium, Hardy |
| Geranium pratense 'Hocus Pocus' | Geranium, Hardy |
| Geranium r. 'Philippe Vapelle' | Geranium, Hardy |
| Geranium 'Rozanne' | Geranium, Hardy |
| Geranium sanguineum 'Alpenglow' | Geranium, Hardy |
| Geranium sanguineum var. 'Striatum' | Geranium, Hardy |
| Geranium sessiliflorum 'Nigricans' | Geranium, Hardy |
| Geranium 'Splish Splash' | Geranium, Hardy |
| Geranium x canta. 'Karmina' | Geranium, Hardy |
| Geranium x magnificum | Geranium, Hardy |
| Geranium x oxonianum 'Sherwood' | Geranium, Hardy |
| Geranium x r. 'Mavis Simpson' | Geranium, Hardy |
| Geum coccineum 'Borisii' | Avens |
| Geum 'Fireball' | Avens |
| Geum 'Lady Stratheden' | Avens |
| Geum 'Mango Lassi' | Avens |
| Ginko Biloba | Maidenhair Tree |
| Gladiolus 'Africa' | Gladiolus |
| Gladiolus 'Blue Ribbon' | Gladiolus |
| Gladiolus 'Grand Prix' | Gladiolus |
| Gladiolus 'Iceberg' | Gladiolus |
| Gladiolus 'King's Gold' | Gladiolus |
| Gladiolus 'Mardi Gras' | Gladiolus |
| Gladiolus 'Royal Tapestry' | Gladiolus |
| Gladiolus 'Veronica' | Gladiolus |
| Gladiolus 'Winner's Circle' | Gladiolus |
| Glecoma hederaceae | Creeping Charlie |
| Globba winitii 'Mauve Dancing Ladies' | Ginger, Flowering |
| Gloriosa 'Rothschildiana' | Climbing Lily |
| Goodyera pubescens | Rattlesnake Plantain |
| Gunnera manicata | Gunnera |
| Gunnera tinctoria | Gunnera |
| Gypsophila p. 'Compacta Plena' | Baby's Breath |
| Gypsophila p. 'Double White' | Baby's Breath |
| Gypsophila paniculata 'Festival' | Baby's Breath |
| Gypsophila paniculata 'Perfecta' | Baby's Breath |
| Gypsophila 'Pink Fairy' | Baby's Breath |
| Habenaria Radiata | Egret Flower |
| Hakonechloa macra 'Albo-striata' | Japanese Forest Grass |
| Hakonechloa macra 'All Gold' | Japanese Forest Grass |
| Hakonechloa macra 'Aureola' | Japanese Forest Grass |
| Hebe 'Red Edge' | Hebe |
| Hebe speciosa 'Tricolor' | Hebe |
| Hedera helix 'Glacier' | Ivy, Variegated |
| Hedera 'Needlepoint' | Ivy, Variegated |
| Hedychium coronarium | Butterfly Lily |
| Hedychium 'Dr Moy' | Ginger, Flowering |
| Hedychium gardenarium | Ginger, Flowering |
| Hedychium greenei | Ginger, Flowering |
| Hedychium x 'Elizabeth' | Ginger, Flowering |
| Helenium autumnale 'Red and Gold' | Helen’s Flower |
| Helenium 'Butterpat' | Helen’s Flower |
| Helenium Hyb. 'Moerheim Beauty' | Helen’s Flower |
| Helenium 'Indian Summer' | Helen’s Flower |
| Helenium 'Mardi Gras' | Helen’s Flower |
| Helianthemum n. 'Fire Dragon' | Sun Rose |
| Helianthemum n. 'Wisley Pink' | Sun Rose |
| Helianthus lact. 'Lemon Queen' | Perennial Sunflower |
| Helianthus s. 'First Light' | Perennial Sunflower |
| Helictotrichon sempervirens | Oat Grass |
| Helleborus argutifolius | Corsican Hellebore |
| Helleborus foetidus 'Frenchy' | Hellebore |
| Helleborus hybridus | Lenten Rose |
| Helleborus 'Ivory Prince' | Hellebore |
| Helleborus niger. ssp. 'Maximus' | Christmas Rose |
| Helleborus o. 'Ballard Hybrid' | Hellebore |
| Helleborus o. 'Red Hybrids' | Hellebore |
| Helleborus o. 'Red Lady' | Hellebore |
| Helleborus o. 'White Spotted Lady' | Hellebore |
| Helleborus 'Winter Queen' | Hellebore |
| Helleborus x hyb. 'Mrs. Betty Ranicar' | Hellebore |
| Helleborus x hyb. 'Royal Heritage Strain' | Hellebore |
| Helleborus x hybridus 'Sunshine Strain' | Hellebore |
| Hemerocallis 'Anzac' | Daylily |
| Hemerocallis 'Bela Lugosi' | Daylily |
| Hemerocallis 'Black Eyed Susan' | Daylily |
| Hemerocallis 'Bodacious Returns' | Daylily |
| Hemerocallis 'Caprician Fiesta' | Daylily |
| Hemerocallis 'Daring Deception' | Daylily |
| Hemerocallis 'Eenie Weenie' | Daylily |
| Hemerocallis 'Gold Embroidery' | Daylily |
| Hemerocallis 'Gordon Biggs' | Daylily |
| Hemerocallis 'Happy Returns' | Daylily |
| Hemerocallis 'Hyperion' | Daylily |
| Hemerocallis 'Ice Carnival' | Daylily |
| Hemerocallis 'Jolyene Nichole' | Daylily |
| Hemerocallis 'Little Grapette' | Daylily |
| Hemerocallis 'Longfield's Twin' | Daylily |
| Hemerocallis 'Mardi Gras Parade' | Daylily |
| Hemerocallis 'Mary's Gold' | Daylily |
| Hemerocallis 'Mini Pearl' | Daylily |
| Hemerocallis 'Patio Parade' | Daylily |
| Hemerocallis 'Ruffled Apricot' | Daylily |
| Hemerocallis 'Siloam Bye Lo' | Daylily |
| Hemerocallis 'Siloam Cinderella' | Daylily |
| Hemerocallis 'Siloam Double Classic' | Daylily |
| Hemerocallis 'Siloam Shocker' | Daylily |
| Hemerocallis 'Siloam Ury Winniford' | Daylily |
| Hemerocallis 'Stella de Oro' | Daylily |
| Hemerocallis 'Strawberry Candy' | Daylily |
| Hemerocallis 'Strawberry Fields Forever' | Daylily |
| Hemerocallis 'Strutter's Ball' | Daylily |
| Hemerocallis 'Wineberry Candy' | Daylily |
| Hepatica acutiloba | Hepatica |
| Hepatica americana | Hepatica |
| Heptacodium miconioides | Seven Son Flower |
| Herniaria glabra | Rupturewort |
| Heuchera 'Amber Waves' | Coral Bells |
| Heuchera 'Amethyst Mist' | Coral Bells |
| Heuchera 'Geisha's Fan' | Coral Bells |
| Heuchera 'Green Spice' | Coral Bells |
| Heuchera 'Hercules' | Coral Bells |
| Heuchera 'Lime Rickey' | Coral Bells |
| Heuchera 'Mardi Gras' | Coral Bells |
| Heuchera 'Marmalade' | Coral Bells |
| Heuchera 'Mars' | Coral Bells |
| Heuchera 'Monet' | Coral Bells |
| Heuchera 'Obsidian' | Coral Bells |
| Heuchera parishii 'Chiqui' | Coral Bells |
| Heuchera 'Raspberry Ice' | Coral Bells |
| Heuchera 'Saturn' | Coral Bells |
| Heuchera 'Silver Lode' | Coral Bells |
| Heuchera 'Snow Angel' | Coral Bells |
| Heuchera 'Starry Night' | Coral Bells |
| Heuchera 'Strawberry Candy' | Coral Bells |
| Heuchera 'Venus' | Coral Bells |
| Heuchera 'Vesuvius' | Coral Bells |
| Heucherella 'Sunspot' | Foamy Bells |
| Hibiscus 'Fireball' | Common Mallow |
| Hibiscus moscheutos 'Lord Baltimore' | Common Mallow |
| Hibiscus moscheutos 'Mallow Marvels' | Common Mallow |
| Hibiscus moscheutos 'Southern Belle Mix' | Common Mallow |
| Hibiscus moscheutos 'Turn of the Century' | Common Mallow |
| Hibiscus 'Plum Crazy' | Common Mallow |
| Holcus mollis 'Albovariegatus' | Velvet Grass |
| Hosta 'Abiqua Drinking Gourd' | Hosta |
| Hosta 'Amber Tiara' | Hosta |
| Hosta 'Aristocrat' | Hosta |
| Hosta 'August Moon' | Hosta |
| Hosta 'Austin Dickinson' | Hosta |
| Hosta 'Beauty Substance' | Hosta |
| Hosta 'Big Daddy' | Hosta |
| Hosta 'Birchwood Parky's Gold' | Hosta |
| Hosta 'Black Hills' | Hosta |
| Hosta 'Cherry Berry' | Hosta |
| Hosta 'Chinese Sunrise' | Hosta |
| Hosta 'Fire & Ice' | Hosta |
| Hosta 'Fragrant Bouquet' | Hosta |
| Hosta 'Francee' | Hosta |
| Hosta 'Frances Williams' | Hosta |
| Hosta 'Ginko Graig' | Hosta |
| Hosta 'Gold Edger' | Hosta |
| Hosta 'Golden Tiara' | Hosta |
| Hosta 'Great Expectations' | Hosta |
| Hosta 'Groundmaster' | Hosta |
| Hosta 'Guacamole' | Hosta |
| Hosta 'Halcyon Blue' | Hosta |
| Hosta 'Independence' | Hosta |
| Hosta 'June' | Hosta |
| Hosta laevigata | Hosta |
| Hosta 'Loyalist' | Hosta |
| Hosta 'Minute Man' | Hosta |
| Hosta 'Mr Big' | Hosta |
| Hosta 'Night Before X-mas' | Hosta |
| Hosta 'Patriot' | Hosta |
| Hosta 'Red October' | Hosta |
| Hosta 'Regal Splendor' | Hosta |
| Hosta 'Remember Me' | Hosta |
| Hosta 'Revolution' | Hosta |
| Hosta 'Saint Elmo's Fire' | Hosta |
| Hosta 'September Sun' | Hosta |
| Hosta 'Serendipity' | Hosta |
| Hosta sieboldiana 'Elegans' | Hosta |
| Hosta 'Silver Kabitan' | Hosta |
| Hosta 'Sum & Substance' | Hosta |
| Hosta 'Wide Brim' | Hosta |
| Hosta 'Wolverine' | Hosta |
| Hosta 'Yellow Splash Rim' | Hosta |
| Houttuynia c. 'Chameleon' | Chameleon Plant |
| Humulus Lupulus 'Aureus' | Golden Hops |
| Hydrangea a. 'Annabelle' | Hydrangea |
| Hydrangea anomala petiolaris | Hydrangea, Climbing |
| Hydrangea 'Fuji Waterfall' | Hydrangea |
| Hydrangea m. 'Glowing Embers' | Hydrangea |
| Hydrangea m. 'Mariesii Variegata' | Hydrangea |
| Hydrangea p. 'Pink Diamond' | Hydrangea |
| Hydrangea panicula 'Limelight' | Hydrangea |
| Hydrangea q. 'PG Pee Wee' | Hydrangea |
| Hydrangea q. 'Snow Queen' | Hydrangea |
| Hydrocotyle sibthorpioides 'Crystal Confetti' | Pennywort, Variegated |
| Hypericum i. 'Summer Gold' | St John's Wort |
| Hypericum x m. 'Tri-color' | St John's Wort |
| Imperata cylindrica 'Red Baron' | Japanese Blood Grass |
| Incarvillea delavayi | Hardy Gloxinia |
| Iris ensata | Iris |
| Iris ensata 'Pin Stripe' | Iris |
| Iris foetidissama | Iris |
| Iris pallida 'Variegata' | Iris |
| Iris pumila 'Lemon Flare' | Iris |
| Iris pumila 'Peppermint Twist' | Iris, Dwarf Bearded |
| Iris s. 'Ruffled Velvet' | Iris |
| Iris setosa var. arctica | Iris |
| Iris sibirica 'Caesar's Brother' | Iris |
| Iris sibirica 'Eric the Red' | Iris |
| Iris sibirica 'Silver Edge' | Iris |
| Itea 'Little Henry' | Sweetspire |
| Jeffersonia dubia | Twinleaf |
| Juncus effusus 'Spiralis' | Corkscrew Rush |
| Juncus effusus 'Spiralis Nana' | Corkscrew Rush, Dwarf |
| Kaempferia gilbertii 'Variegated Peacock Ginger' | Ginger, Flowering |
| Kalimeris incisa 'Variegata' | Kalimeris |
| Kalmia latifolia | Mountain Laurel |
| Kerria Japonica 'Picta' | Kerria |
| Kirengeshoma palmata | Yellow Waxbells |
| Kitaibelia vitifolia | Russian Hibiscus |
| Knautia macedonica | Knautia |
| Knautia macedonica 'Mars Midget' | Knautia |
| Kniphofia 'Alcazar' | Red Hot Poker |
| Kniphofia 'Border Ballet' | Red Hot Poker |
| Kniphofia 'Cobra' | Red Hot Poker |
| Kniphofia hyb. 'Nancy's Red' | Red Hot Poker |
| Kniphofia 'Little Maid' | Red Hot Poker |
| Kniphofia 'Shining Scepter' | Red Hot Poker |
