- American Dahlia Society
- Includes membership information and grow guides.
- American Gloxinia & Gesneriad Society
- Offers culture information, membership benefits, resources, photos, and flower show schedules.
- American Iris Society
- Official website offering plant and organizational information, forums, and a calendar of upcoming events.
- Association of Societies for Growing Australian Plants
- Highlights the activities of the organization dedicated to the cultivation of the country's native flora. Includes history, objectives, membership and publications.
- Botanic Gardens Conservation International (BGCI)
- Links over 800 botanic gardens and botanical institutions in more than 120 countries in a worldwide network for plant conservation, environmental education and sustainable development.
- British & European Geranium Society
- Features plant care information, a list of member services, and links.
- Bromeliad Society International
- Provides a list of group publications, membership information, and a list of member services.
- The Brown Lawn Society
- Advocates for sustainable gardening and natural plant propagation. Campaigns for environmentalism among all.
- Canadian Botanical Conservation Network (CBCN)
- Introduces the activities and programs of CBCN - a group whose objective is to preserve the biological diversity of Canada's rare and endangered native plant species.
- City Farmer
- Site of Canada's Office of Urban Agriculture. Presents urban agricultural notes.
- The Garden Club of America
- Official site of a group that aims to stimulate the knowledge and love of gardening.
- Gardeners' Club
- Directory of local gardening societies in the United States.
- International Carnivorous Plant Society
- Features news, online journals, conservation information, and resources.
- Lesbian Gardens
- Mailing list for lesbians who share the passion for gardening. Provides messages, recipes, and links to other gardening websites.
- The Mediterranean Garden Society
- Serves as an international forum for the furthering of gardening knowledge and the appreciation of plants and gardens fit for the mediterranean climate.
- Professional Gardener's Guild
- Provides membership information, job postings, links, and an online diary.
- Royal Horticultural Society
- Contains gardening news, an online shop for gardening tools and supplies, and information on garden plants and designs.
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