Abercorn Plant & Garden Centre - Regional Garden Centre
Able Gardener - Gardening Supplies for the Disabled

Access Garden Products - Greenhouse Heaters & Garden Accessories
Accessible Friends Network - Gardening for the Visually Impaired
Ace of Koi - Fish & Fish Care
Active Toy Company - Garden Toys

Advance Greenhouses - Greenhouse and Equipment Supplies

African Garden - African Bulb Information
Afton Park - Regional Gardens, Orchard & Plant Nursery

AHS Direct - Garden Accessories

All About Orchids - Orchid Information
All Seasons Landscape Gardening - Regional Landscape Gardening Service
Allotment Growing - Allotment Information
Allotment & Kitchen Gardens - Vegetable Gardening Information
Allotments UK - Allotment Information
Allwoods - Carnations & Pinks
Alpine Garden - Alpine & Rockery Gardening
Alpine Garden Society - Alpine & Rockery Plant Information

Amazon - Gardening Books
American Brugmansia & Datura Society - Brugmansia & Datura Information

Animal Instinct - Animal Kennels

Aphids.us - Aphid Information
Apuldram Roses - Rose Suppliers

Aquilegia Chat Group - Aguilegia Discussion Group
Aquilegia Seed - Aquilegia Seeds

Arbor Services - Regional Garden Services
Arbordeck - Wooden Decking
Arboreta - Barbecues, Garden Furniture, Hammocks, Garden Heat & Light Products
Arcadia Garden Centre - Regional Garden Centre
Architectural Plants - Big & Exotic Plants

Askett Nurseries - Regional Plant Nurseries
Association Kokopelli - Organic Seeds
Association of British Conifer Growers - Conifer Information
Association of Garden Trusts - Park & Garden Conservation

Australasian Plant Society - Information about the Plants of Australia & New Zealand
Australian Hibiscus Society - Hisbiscus Information