- National Gardening Association
 - Extensive gardening resource that includes feature articles, ideas, regional reports, how-to information, a buyer's guide, online message boards, and more.  National Gardens Scheme
- Raises money for selected charities by opening gardens of quality and interest to the public. Publishes a reference guide to private gardens open to all.- Garden Conservancy, The
- National, nonprofit organisation founded in 1989 to preserve exceptional American gardens for the public's education and enjoyment.
- Garden Club of America (GCA) (2)
- Mediterranean Garden Society
- Forum for anyone who has a special interest in the plants and gardens of Mediterranean climate regions.
- Seattle Tilth
- Inspires and educates people to garden organically, conserve natural resources, and support local food systems in order to cultivate a healthy urban environment and community.
- Xeriscape Colorado!, Inc.
- Offers an overview of this water saving practice, address of educational gardens in Colorado, upcoming events, and more.
- Florida Federation of Garden Clubs, Inc.
- Includes information on state activities, scholarships, youth camp floral designs, a garden of the month, local clubs, and more.
- Master Gardeners of California@
- Calgary Horticultural Society
- Includes tips for gardening in Calgary, gardening events in Calgary, links to other Canadian gardening web pages, and information on how to join the society.
- Association of Online Growers and Suppliers
- National Society of Allotment & Leisure Gardeners
- Aims to help everyone enjoy the recreation of gardening and so promote health, education, and community fellowship.
- National Association for the Conservation of Plants & Gardens
- Seeks to conserve, promote, and make available Britain and Ireland's biodiversity of garden plants for the benefit of horticulture and science.
- World Wide Pressed Flower Guild
- Brings the world's pressed flower artists together.
- California Horticultural Society
- Educational, nonprofit organisation dedicated to bringing together gardeners and garden professionals to share experiences.
- Perennial - Gardeners' Royal Benevolent Society
- U.K. charity helping horticulturists in need, by providing support services for those who are working in, have worked in, or are retired from the industry.
- Garden Writers Association (GWA)
- Organisation of professionals communicating about horticulture, gardening, and the environment.
- Canadian Sphagnum Peat Moss Association
- Represents peat moss producers; educates consumers, writers, retailers, environmentalists, and gardeners.
- River Oaks Garden Club
- California Garden Clubs
- Federation of California garden clubs and plant societies.
- Modesto Garden Club
- Offers gardening activities and programmes for its members and guests. Projects include landscaping, hanging baskets, and colourful flower pots in downtown Modesto.
- Colorado Federation Of Garden Clubs
- Provides information on clubs, flower shows and gardening tours, and links to other Colorado gardening resources.
- Over the Garden Gate!
- Newsletter of the Wichita County Master Gardener's Association, Texas, written in cooperation with the Texas Agricultural Extension Service.
- Gardeners Of America, The / Men's Garden Clubs of America
- National organisation that emphasizes gardening education and community beautification.
- Flitwick Gardeners Association
- Includes information about the Seed Box shop, membership fees and benefits, and the group's history.
- Hudson Garden Club
- Hosts the annual Hudson Home and Garden Tour through private gardens and homes Hudson, Ohio.
- Garden Club of Georgia
- Tacoma Garden Club
- Description of Pacific Northwest growing conditions and the Native Garden at Point Defiance Park, Tacoma, WA, USA.
- West Chicago Garden Club
- General interest garden club located in the Western suburbs of Chicago.
- Dumfries & Galloway Plant Heritage
- For people interested in rare plants and their conservation, featuring organised events, plant exchange, and forum.
- Home Gardening Project Foundation
- Dedicated to giving free vegetable gardens to those in need.
- Cabell County Master Gardening Program
- Dedicated to assisting the general population with gardening questions and gardening help.
- Men's Garden Club of Minneapolis
- Contains information about actvities and events, history, and more.
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