- Albright Seed Company
 - includes information on plant science, turf grass, wildflowers, beneficial fungi, fertilizers, and more. - Angelgrove Tree Seed Company
- specialises in seeds suitable for the North American climate, including those of shrubs and Japanese ornamental, flowering, and bonsai trees.
 ANi Direct Seeds
- Supplies seeds for palms, cacti, bonsai, herbs, trees, and many more plants.- Barenbrug UK Ltd
- Supplier and distributor of grass seeds to the amenity and agriculture sectors.
- Beaver Seed Company, The
- Offers Native American seeds, plants, beads, flutes, and speciality items.
- Borghese Gardens
- importing and distributing rare seeds. Offering catalogue and mail order services.
- Brett Young Seeds Ltd
- Grain buyer and seed grower for local and international.
- Burpee Gardens
- Flowers, vegetables, bedding plants, and container gardens. Plus, an interactive section where gardeners can have questions answered by Burpee's experts.
- Buy Pasture Grass
- Offers pasture grass seeds, red clover, hairy vetch, deer feed varieties, and other pasture mixtures.
- California Hybrids
- Specialises in red and yellow tomato seed development with expertise in high yield, high flavour varieties.
- Cook's Garden
- offering traditional and hybrid vegetable, herb, and flower seeds. Also has gardening supplies, books and helpful information.
- Crosman's Seeds
- Provides flower, vegetable and grass seed. Also offers custom-printed packets.
- D. T. Brown & Co. Ltd
- Flower and vegetable seed merchants browse or order a catalogue.
- David Cheshire Seeds
- Specialises in rare, unusual, and wild Alpine and herbaceous plant seeds.
- Davis Plant and Seed Company
- De Bruyn Seed Store
- Offers vegetable and flower seeds, seed potatoes, onion sets, flower bulbs, and field seeds.
- Dill's Atlantic Giant
- Offering seeds, supplies, and tips for growing giant pumpkins.
- Dominion Seed House
- Mail-order horticulture catalogue featuring seeds, flowers, annuals, and accessories.
- Douglas-Michel Enterprises
- Dedicated to providing butterfly plants and seeds. Speciality is growing perennials that provide nectar for butterflies.
- Dowdeswell's Delphiniums
- Includes history and growing information of delphiniums. Offering fresh delphinium seeds worldwide.
- Ernst Conservation Seeds
- Wholesaler of wetland, upland, woodland, and wildflower seeds.
- George Burlingham And Sons Ltd.
- Seed testing.
- Glacial Ginseng Co.
- Grower and seed dealer.
- Gourmet Gardener, The
- hard-to-find herbs, vegetables and edible flowers from around the world selected for the best flavour. Also including special gifts and books.
- Grow From Seed
- Large variety of plant and flower seeds including many organic vegetables.
- Gurney's Seed & Nursery Company
- Offering catalogue and online ordering.
- Heirloom Seeds
- Old fashioned, open-pollinated vegetable, flower and herb seeds. Also free tips and questions answered on the site.
- Heirloom Tomatoes
- old fashioned tomato seeds for home gardeners, specialising in heirloom varieties.
- Henry Field's
- Sells seeds for vegetables, herbs, perennials, lawns, roses, and other plants.
- Johnny's Selected Seeds
- Offers vegetable seeds, medicinal and culinary herb seeds, and flower seeds to the wholesale and retail market.
- Jungle Seeds
- Offers exotic seeds for tropical bedding in the U.K., including hardy bananas and palms.
- Krazy Keith's Garden Shed
- Sells annuals, perennials, seeds, plants, bulbs, and more.
- Larner Seeds
- Sells native California seeds and plants. Also sells the book Gardening with a Wild Heart by Judith Larner Lowry.
- Lehle Seeds
- Commercial producer of Arabidopsis seeds, plus links to Arabidopsis sites.
- Lonestar Seed Company
- Flower and vegetable seeds for gardeners, landscapers, and greenhouses.
- MAS Seed Specialists
- Suppliers of wild flower, amenity and agricultural seed.
- Native American Seed
- wildflower and prairie grass seeds.
- Nichols Garden Nursery
- Herbs and garden seeds catalogue featuring new and unusual vegetables, herbs, and flowers.
- Nickys Herb and Wildflower Bulk Seeds
- Sells herbs, native British wild flower mixtures and lawn seed for amenity and landscaping.
- Pacific Coast Tropical Gardens
- Retailer of seeds of subtropical and tropical ornamentals, fruits, herbs, palms, rare and unusual species; and related books.
- Passiflora
- selling wholesale and retail passion flower seeds and exotic plants.
- Pennington Seed
- Includes lawn and forage seed.
- Pickseed Canada
- Range includes corn, forage, turf, and lawn seeds.
- Pinetree Garden Seeds
- Provides home gardeners with seeds in appropriately sized packages.
- Plant World Seeds
- Online store for a variety of seeds. Site gives catalogue and information about the garden and nursery. Located in Newton Abbot, U.K.
- Plantation House Tobacco Seeds
- Sells Virginia and Havanna seeds and provides instructions for growing and curing tobacco.
- Plantworld Seeds
- Specialising in rare and unusual perennials, garden plants, and flowers.
- Prairie Nursery
- Offers plants and seeds for ecological gardening and natural landscaping, as well as providing natural landscaping consulting services.
- PT. Selektani
- Grows and offers horticultural seeds for the Indonesian and international market.
- Pure Land Ethnobotanicals
- Specialises in salvia divinorum, offers rare seeds, herbs, and extracts.
- rarepalmseeds.com
- Offering a wide range of rare palm, banana, and cycad seeds from around the world for both collectors and large nurseries.
- Rarexoticseeds
- Specialises in exotic seeds including bonsai, carnivorous plants, and palms.
- Redwood City Seed Company
- Alternative seed company lists rare and endangered vegetables and specialises in hot peppers and herbs.
- Reimer Seeds
- Sells varieties of vegetable seeds for home gardens.
- Renee's Garden Seeds
- Offers flower, vegetable and herb seeds in colourful packets with growing tips and harvesting information.
- Rex's Seedco
- Tomato and Chinese vegetable seeds.
- Richters Herbs
- Specialists in medicinal, culinary, and aromatic herb plants and seeds. Includes herb catalogue and information for consumer and wholesale customers. Offers tips on herbal animal care, kitchen herbs, and herb usage.
- Rocky Mountain Rare Plants
- Offering seeds for alpine plants.
- Round Butte Seed Growers
- Suppliers of wholesale and retail speciality grass seeds, wildflower seeds, and pigeon food to the USA and Canada.
- Sakata Seeds America, Inc.
- Wholesale distributor of flower and vegetable seeds.
- SBE
- Offers herb, vegetable, flower seeds, and more.
- Secret Seeds
- Offers seeds of rare and unusual plants. Site gives collections and online shopping facility with instructions on importing seeds into different countries.
- Seed Guild, The
- unusual and rare seeds from around the world.
- Seed Library
- In addition to selling packets of heirloom seeds, the Seed Library runs a not-for-profit seed borrowing programme where backyard gardeners cooperate to save seeds with local history. Seed Library specialises in heirloom seeds for Northeast gardeners.
- Seedland.com
- Offers a wide range of different varieties and cultivars of grass seed.
- Seeds by Size
- Seeds, commercial gene bank, vegetables, herbs, and more.
- Seeds Express
- Offers thousands of tropical varieties to choose from.
- Seeds Trust, Inc.
- Sells open-pollinated, heirloom seed adapted to cold, short seasons. International Seed Saving Institute educates about conservation of plant genetic resources and seed saving.
- seeds2you.com
- Online seed shop. Also provides gardening advice, tips, and more.
- Select Seeds Antique Flowers
- Offers rare, old-fashioned flower varieties as well as starter plants, flowering vines, and more.
- Semillas Zulueta, S.A.
- Native and wild seeds, and plants for revegetation, reclamation, environment, management and erosion control.
- Shaman Australis Ethnobotanicals
- Offering ethnobotanicals from Australia and the world, specialising in rare and endangered plants. Includes seeds of the Mitragyna speciosa, Yohimbe, Ephedra, Pituri, and more.
- Shepherd's Garden Seeds
- includes catalogue, newsletter, and recipes.
- Southern Exposure Seed Exchange
- mail-order source of heirloom and traditional varieties of vegetable, flower, and herb seed.
- Stokes Seeds
- Flowers, vegetables, herbs, and perennial seeds, also includes, garden accessories.
- Sunmark Seeds International
- Information and specifications for wildflowers, native grasses, turf, prairie and speciality seeds.
- Tea Herb Farm
- Seeds, organic produce, and herbs.
- Teakettle Enterprises Ltd.
- Wholesale grower and distributor of ornamental plant seeds. Large selection of palms.
- Territorial Seed Company
- Vegetable, flower and herb seeds available to the home gardener and to commercial growers; software, CDs and videos related to gardening.
- The Prairie Is My Garden, Seed Company
- Specialising in providing native wildflower and prairie grass seed, suitable for USDA growing zones 2-5.
- Thompson & Morgan Garden Seeds
- Offers a huge selection of quality flower, vegetable and herb seeds including rare, award winning, new and exclusive varieties. Also provides growing information.
- Thompson & Morgan Ltd
- Offerings include flower, vegetable, and herb seeds, as well as young plants.
- Tobacco Seed Company, The
- Sells a variety of tobacco seeds. Also includes growing advice.
- Tomato Growers Supply Company
- Offers seeds for many varieties of tomatoes and peppers.
- TomatoFest
- Offers organic and heirloom tomato seeds, gardening supplies, recipes, event information, and merchandise.
- Totally Tomatoes
- Sells primarily tomato and pepper seeds, as well as other garden vegetables.
- Tree in a Box
- Offers seed kits for a variety of occasions.
- Trelay Seed Company
- Supplying the midwest with seed corn, alfalfa, small grain, pasture mixes and more.
- Underwood Gardens
- Specialising in rare, heirloom seeds for unusual vegetables, herbs and flowers, hard-to-find varieties, antique apples, and more.
- Urban Garden
- Online shop for vegetable, flower, herb, and ornamental grass seeds and garden accessories. Quick shipping available.
- Vesey's Seeds Ltd.
- Specialise in seeds for short seasons.
- Victory Seed Company
- Family owned and operated packet seed company specialising in non-hybrid vegetable, herb and flower seeds.
- Virtual Seeds
- for garden, home and farm.
- Weslyn Herb Farm
- offers herbs, scented geraniums, and hot peppers.
- Whatcom Seed Company
- Offering a wide variety of rare, exotic, and unusual seeds.
- William Moore Farms
- Offers several different varieties of ornamental grass seed that you can use all year long to keep your garden uniquely beautiful.
- WorldSeed
- offers vegetable, flower and herb seeds from the USA, U.K. and Italy.
- Yankee Gardener
- Offers collections for the first time planter, children, vegetables, herbs, and flowers. Provides recipes, charts, maps, and other planting resources.
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