AgriculturalLink.com integrates agriculture and livestock websites help you find agritourism, poultry, garden, production, farmer, goat, fodder crops, horticultural crop and more.
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UK

Listings
Contains a buyers guide for equipment, horticultural products, plants and services.
http://www.cha-hort.com/
Gardening retailers, growers, wholesalers, manufacturers, and service providers in the United Kingdom.
http://www.the-hta.org.uk/