Alabama Nurserymen's Association - a professional association for those involved in and allied to the ornamental horticulture industry.

American Horticulture Society - bringing the world of gardening to you.

American Society for Horticultural Sciences - promotes and encourages scientific research and education in horticulture within the United States and throughout the world.

Arizona Nursery Association - professional trade organization established in 1989 dedicated to the promotion and advancement of the nursery industry for its members and the public they serve.

Botanical Society of America - promotes research and teaching in all fields of plant biology, to facilitate cooperation among plant biologists and other scientists worldwide, and to disseminate knowledge of plants, algae and fungi to all groups of society.

Florida Nurserymen & Growers Association - represents the interests of nearly 2,000 foliage, woody and floriculture producers, landscape contractors, retailers and allied suppliers.

Florida State Horticultural Society - society representing citrus, vegetables, ornamentals, tropicals, and the processing and handling of fruits and vegetables.

International Society for Horticultural Science - formally established in 1959, and is now the leading worldwide organization of horticultural scientists with contacts all over the world.

Idaho Nursery Association - organization of professionals interested in updating their knowledge and increasing their skills in the horticulture industry.

Louisiana Association of Nurserymen - a professional organization representing Louisiana's ornamental horticulture industry.

Massachusetts Flower Growers Association - established in 1947 to promote and advance the Massachusetts flower industry.

Massachusetts Nursery and Landscape Association

National Gardening Association - helps gardeners through innovative science education programs and garden-related research.

New York State Nursery/Landscape Association, Inc. - the only organization serving the interests of nursery growers and lanscapers in New York.

Northwest Horticultural Council - incorporated in 1947, its current work focuses on national and international policy issues affecting growers and shippers in Idaho, Oregon and Washington.

Nursery Industry Association of Australia - represents the interests of all sectors of the Australian nursey industry including growers, wholesalers, retailers, allied traders, and consultants.

Ohio Nursery and Landscape Association - trade association representing the interests of the state's nursery, garden center and landscape industry.

S&G Flowers - the ornamental flowers brand of Syngenta, which breeds, markets and distributes superior quality propietary flowers in the form of seeds.

Texas Association of Nurserymen - trade association for the nursery and landscape industry in the State of Texas.

Utah State Horticultural Association

Washington State Horticultural Association - mission to advance and enhance the tree fruit industry in Washington State.

European and Mediterranean Plant Protection Organization (EPPO) - an intergovernmental organization responsible for international cooperation in plant protection in the European and Mediterranean region.

International Plant Protection Convention - a multilateral treaty deposited with the Director-General of the Food and Agriculture Organization of the United Nations (FAO) and administered though the IPPC Secretariat located in FAO's Plant Protection Service.

National Plant Board - an organization of the plant pest regulatory agencies of each of the states and the Commonwealth of Puerto Rico.

North American Plant Protection Organization - a regional plant protection organization of the International Plant Protection Convention, which coordinates the efforts among Canada, the United States and Mexico to protect plant resources from the entry, establishment and spread of regulated pests.

Pest Exclusion - an APHIS site containing commodity pest risk assessments for plants and plant products and other information on keeping foreign pests and diseases out of the United States.

Plant Protection and Quarantine - an APHIS site that contains information on agency activities, permits and regulations concerning plant protection.

USDA's Animal and Plant Health Inspection Service - a USDA agency that provides leadership in ensuring the health and care of animals and plants.

Cornell University Department of Horticulture - provides education, extension and research information on horticulture.

North Carolina State Department of Horticultural Science - contains departmental, commodity and other horticultural information.

Texas A&M University System - Aggie Horticulture Network - contains Master Gardener information, links to botanic gardens and arboreta world-wide, a section on plant tissue culture, and more.