| Company |
| H & R Nurseries Inc. |
| H Potter |
| H.E.R. Ladyslippers Inc. |
| H2othouse, Inc. Greenhouses |
| Ha'iku Maui Orchids |
| Hadaway Farms |
| Hadeco Bulbs |
| Hahn's Rainbow Iris Garden |
| Haleahi Orchid Ranch |
| Halfen Garden Center & Hosta Gardens |
| Halifax Seed |
| Hall's Christmas Tree Farm |
| Hall's Wormery |
| Halling's Platyceriums |
| Halls of Heddon |
| Hamilton Dahlia Farm |
| Hammacher Schlemmer |
| Hammocks.com |
| Hampshire Carnivorous Plants |
| Hampton's Buzaar |
| Hana Farms LLC (formerly Red's Hardy Orchids) |
| Hanalei Nursery Bromeliad Growers |
| Hancock Seed Company |
| Hand Helpers |
| Hand Picked Nursery |
| Hand to Land Flower Farm |
| Handlebar Hosta Farms |
| Hang'um Planters |
| HangaPot.com (c/o Hanging Gardens) |
| Hannas Seeds |
| Hans Baskets |
| Hansen Ironworks |
| Hansen Nursery |
| Happiness Farms, Inc. Caladium Bulbs |
| Happy Cat Heirloom Seeds |
| Happy D Ranch |
| Happy Harvest Hydroponic & Organic Supply |
| Happygarden |
| Harbor Freight (HarborFreight.com) |
| Harborcrest Gardens (African Violets by Mail) |
| Hardy Bamboo |
| Hardy Daylilies From Eve's Garden |
| Hardy Daylily Garden |
| Hardy Grapes for the Canada Cold |
| Hardy Orchids |
| Hardy Palm Tree Farm |
| Hardy Tropicals |
| Hardy Water Lilies of Oregon |
| Hardy's Cottage Garden Plants |
| HardyCyclamens.com |
| Hardyplants.com |
| Harkness Roses |
| Harlane Company, Inc. |
| Harlin Grove LLC |
| Harmon Hill Farm |
| Harmonia Gardens, Inc. |
| Harmony Farm Supply & Nursery |
| Harrells Hardy Plants |
| Harrietta Hills Pond and Water Management |
| Harris Citrus Nursery |
| Harris Seeds / Garden Trends |
| Harrod Horticultural |
| Harrowsmith Country Life Magazine |
| Hart Canna |
| Hart's Daylilies |
| Hartle-Gilman Gardens |
| Hartle/Gilman Gardens |
| Hartmann's Plant Company |
| Hartwood Roses |
| Harvest Nursery |
| HarvesTime Nursery |
| Harveys Garden Plants |
| Haskap Central Sales Ltd. |
| Hatch Chile Express |
| Hatfield Orchids |
| Hatten's Nursery |
| Hauser's Superior View Farm |
| Haute Gardens |
| Havahart® |
| Hawaii Orchids |
| Hawaiian Botanicals |
| Hawaiian Orchid Source (Marty's Orchids) |
| Hawaiian Sunshine Nursery |
| Hawaiian Tropical Plant Nursery, LLC (Pacific Tropical Gardens, LLC) |
| Hawaiian Tropicals Direct |
| Hawaiian-Tropical-Flowers.com, LLC |
| Hawkvalley Hemerocallis Haven |
| HawsWateringCans.com (Haws Watering Cans) |
| Hawthorn Farm Organic Seeds |
| Hawthorn Hill Daylily Farm |
| Hawthornes Nursery |
| Hayes Daylilies |
| Hayloft Plants |
| Hazorea Aquatics |
| Hazzard's Greenhouse |
| HB-101 (YK Flora, Inc.) |
| HBI Inc. |
| HDRA Heritage Seed Library |
| Heart Garden Nursery |
| Heart of England Garden Buildings |
| HeartHoe.com (Disc-Hoe Marketing, Inc.) |
| Heartland Blueberries |
| Heartland Hydrogardens |
| Heartland Seed of Missouri |
| Hearts-Ease Greenhouse & Nursery (Tewksbury Orchids) |
| Heartwood International |
| Heartwood Nursery |
| Heasley Nurseries Inc |
| Heaths and Heathers |
| Heaven in Earth |
| Heavenly Gardens |
| Heavenly Seed |
| Hedera Etc. |
| Hedges Online |
| Heirloom Acres Seeds |
| Heirloom Cottage Garden |
| Heirloom Onions (HeirloomOnions.com) |
| Heirloom Organics |
| Heirloom Roses |
| Heirloom Roses Canada (Old Heirloom Roses) |
| Heirloom Seeds |
| Heirloom Seeds and Plants |
| Heirloom Tomato Seed Exchange |
| Heirloom Tomatoes |
| Heirloom Tomatoes (formerly Chuck Wyatt's Heirloom Tomatoes) |
| Heirloom Tomatoes of Texas |
| Heirloom's Daylily Website |
| Helen Deering |
| Helen's Dahlias |
| Heliconia Paradise |
| Helleborus.com |
| Hem Haven Daylily Nursery (edaylilies.com) |
| Hemerocalle Bmar |
| Hemerocalles Daniel Matton |
| Hemerocalles de l'Isle |
| hemerocallia.com |
| Hemerocallis Montfort |
| Hen & Chicks |
| Henry Field's Seed & Nursery |
| Henry Field's Seed & Nursery Co. (Canada) |
| Henspa (Egganic Industries) |
| Herb Cottage |
| Herb Garden Kits |
| Herb Roots |
| Herb'n Gardens Pre-Planted Seed Mats |
| Herbaceous Hoarders Nursery |
| HerbalCroft Gardens (formerly Botanee Herb Farm) |
| Herbalistics |
| HerbFresh.com |
| Herbin' Center |
| Herbiseed |
| HerbKits.com |
| Herbkitsonline.com |
| Heritage Bulbs (part of Heritage Gardening Ltd.) |
| Heritage Farm & Fruit Trees LLC |
| Heritage Farms (Kay Home Products) |
| Heritage Flower Farm |
| Heritage Fruits |
| Heritage Gardens |
| Heritage Gardens |
| Heritage Harvest Seed |
| Heritage Rosarium |
| Heritage Rose Gardens |
| Heritage Seed Market (formerly Heritage Tomato Seeds) |
| Heritage Stone Art |
| Heritage Tomato Seed |
| Hermann Englemann Greenhouses Inc. (Exotic Angel) |
| Hermit Medlars Walk |
| Herons Bonsai Nursery |
| Heronswood Nursery |
| Herrington Daylily Gardens |
| Herter Nursery |
| Heschke Gardens |
| Heyne Custom Seed Services |
| Heze East Flowers Co., Ltd. |
| Heze Spring Nursery |
| HG Specialties Water Gardening (formerly Hamlet & Garneau) |
| Hi-Mark Begonias (Hi-Mark Nursery, Inc.) |
| Hibiscus and More |
| Hibiscus Lady Nursery |
| Hibiscus Place (Martindale's Nursery) |
| Hickory Gardens |
| Hickory Hill Daylilies |
| Hida Tool & Hardware |
| Hidden Acres Iris Gardens |
| Hidden Acres Nursery |
| Hidden Garden Nursery |
| Hidden House Bulbs |
| Hidden Meadow Farm |
| Hidden Springs Flower Farm |
| Hidden Springs Nursery |
| Hidden Valley Hibiscus |
| High Altitude Gardens |
| High Country Gardens |
| High Country Roses |
| High Country Tree & Wreath Company |
| High Desert Dahlias |
| High Desert Seed+Gardens |
| High Ground Gardens |
| High Mowing Organic Seeds |
| High Sierra Iris |
| High Sierra Nursery |
| Highfield Nurseries |
| Highland Blooms & Perennial Gardens |
| Highland Heather |
| Highlander Nursery |
| Highview Garden Nursery |
| Hilcrest Flowers |
| Hildenbrandt's Iris Gardens |
| Hill Country Flutterings |
| Hill Country Water Garden & Nursery |
| Hill Top Aquatic Gardens (Hilltopwatergardens.com) |
| Hillcrest Harmony Flowers |
| Hillcrest Hostas & More |
| Hills Creek Nursery |
| Hills Epicacti |
| Hillside Farms (Garden Stuff.com) |
| Hillside Nursery |
| Hillsview Gardens Orchid Nursery |
| Hilltop Farm |
| Hilltop Fruit Trees (formerly Hilltop Nurseries) |
| Hilltop Gardens |
| Hilltop Greenhouse & Farm |
| Hilltop Trees, Inc. |
| Hillview Hardy Plants |
| Himalayan Gardens Ltd. |
| Hinck & Wall, Inc. - Antiquarian Booksellers |
| Hippeastrums.co.uk |
| Hippie Mulch |
| Hirt's Gardens (formerly Hirt's Greenhouse & Flowers) |
| His Iris Garden |
| His Sunny Slope Garlic Farm |
| History Stones (Flex Teck/Artistic Gardener) |
| Ho-Ti Nursery |
| Hob Knobs |
| Hobby Farms Magazine |
| Hobby Gardens |
| Hodnick Company (L'Entreprise Hodnik) |
| Hoe-dag LLC |
| Hoffman Hatchery Inc. |
| Hoffman Nursery |
| Holden Clough Nursery |
| Holderread Waterfowl Farm & Preservation Center |
| Hole's Greenhouses |
| Holladay Jungle |
| Holland Bulb Farms |
| Holland Bulb Farms |
| Holland Flora, LLC (HollandFlora.com) |
| Holland Gardens |
| Holland Pride |
| Holland Wildflower Farm |
| Hollingsworth Peonies |
| Hollow Creek Bonsai Nursery |
| Hollow Creek Bonsai Nursery and Gardens |
| Hollow Creek Tree Farm |
| Holly Gate Cactus Nursery |
| Holly Hill Nurseries |
| Holly Lane Gardens |
| Holly Ridge Nursery |
| Hollyhill Dahlias |
| Holt Geraniums |
| Home & Garden Decor |
| Home & Vine |
| Home and Garden Sales Online (Midwest Internet Sales) |
| Home and Garden World Gifts |
| Home Depot |
| Home Garden Seeds Ltd. |
| Home Garden Tool |
| Home Grown Plants |
| Home Harvest Garden Supply (Division of Superior Growers Supply, Inc.) |
| Home, Garden & Patio Outlet |
| Homegrown Hydroponics |
| Homegrown Hydroponics |
| Homeplace Garden Nursery |
| Homeplace Gardens |
| Homestead Dahlias |
| Homestead Division of Sunnybrook Farms |
| Homestead Farms |
| Homestead Gardens |
| HomeStyle Books |
| Hometown Seeds |
| Honey Hill Hostas & Garden Art |
| Honey Run Apiaries |
| Honey Tree Nursery |
| Honeybees Paradise |
| Honeyberry USA |
| Honeycreek Nurseries |
| Honeyman Farms (honeymanseed.com) |
| Honeyman Farms (lettuceseeds.com) |
| Honker Flats |
| Hood River Garlic |
| Hooks and Lattice |
| Hoop House Greenhouse Kits |
| Hoosier Orchid Company |
| Hoot Owl Daylily Garden |
| Hoot Owl Hollow Nursery |
| Hoover Fence Co. |
| Hoover's Hatchery, Inc. |
| Hope Greenhouses |
| Hopleys Plants Ltd. |
| Horizen Hydroponics |
| Horizon Herbs, LLC |
| Horn Canna Farm |
| Hornbaker Gardens |
| Horner Farms Inc |
| Horner Lilies |
| Horse Creek Seed Sanctuary |
| Hortica Gardens |
| Horticlub (formerly W.H. Perron) |
| Hortico Nurseries Inc. |
| Horticultural Alliance, Inc. |
| Horticultural Impex |
| Horticultural Products and Services (HPS) |
| Horticultural Systems Inc |
| Horticulture |
| Horticulture Guy's Garden Supply |
| Horticulture Source |
| HorticultureSource.com |
| Horton Iris Garden |
| Hortons Nursery |
| Hortplus |
| HORTUS |
| Hortus Ornamenti |
| Horus Botanical |
| Hos-Tas Pty Ltd |
| Hosking Nursery |
| Hoss Tools (K & B Development, LLC) |
| Hosta Choice Gardens |
| Hosta Fever |
| Hosta Haven (dba Country Glow Soy Candles) |
| Hosta Hideaway |
| Hosta Liners |
| Hosta Patch |
| Hosta Trader (Little Flora) |
| Hostas & Zo |
| Hostas By Michael |
| Hostas by Sissinghurst |
| Hostas N Lilies (Thom Agri Perennials Inc.) |
| Hostas Online |
| Hostas Online Shop (Park Green Nurseries) |
| HostasGalore |
| Hostasmith |
| HostaWorks |
| Hot Pepper Wax |
| Hound Dog Products Inc. |
| House of Hosta |
| House of Hosta |
| House of Masque |
| House of Wesley |
| House Proud Conservatories |
| Houseplant Box |
| Houston Bamboo Nursery Farm |
| Howard Dill Enterprises |
| Howard Equipment & Supply |
| Howard Hashem Enterprises |
| Howe Knoll Farm |
| Howe Seeds |
| Hoya Plants.com |
| Hramor Nursery |
| Hsu's Ginseng Enterprises |
| HTGSupply (High Tech Garden Supply) |
| Hudson Valley Seed Library |
| Huggins Farm Irises |
| Hughes Nursery |
| Hughes Water Gardens (thewatergardenshop.com) |
| Humble Seed |
| Humboldt Hydroponics |
| Hummert International |
| Hummert Seeds (formerly Chesmore Seed Company) |
| Humming Landscapes Nursery |
| Hummingbird Farm |
| Hummingbird Gardens |
| Hummingbird House™ |
| Hummingbird World |
| HummingbirdHub.com (Backyard Magic) |
| Hunter's Torch Daylily Garden |
| Huntington Beach Orchids |
| Huntington Botanical Gardens |
| Hurley Orchids |
| Hutton Hostas |
| Hyannis Country Garden |
| Hybrid Daylily |
| Hybrid Poplar Trees |
| Hybridizer Pro |
| HYDRA Aquatic, Inc |
| Hydrangeas Plus |
| Hydro Harry's (Harry's Garden Center) |
| Hydro Heaven |
| Hydro-Gardens |
| Hydro-Orchids.com |
| Hydro-Stacker (Hydrostacker.com) |
| Hydro-Stacker Canada Inc. |
| Hydroasis Superstore |
| HydroEmpire |
| Hydrofarm Horticultural Products |
| Hydroponic Garden Centers Inc. |
| Hydroponics Outlet |
| Hydrosphere Water Gardens & Fisheries |
| HydroWarehouse Online Superstore |
| HypnoticBlooms |
| HyR BRIX™ |
| Hythe Alpines |
