- Canadian Botanical Conservation Network - A registered charitable organization which helps conserve biological diversity through networking tools and conservation programs for botanical gardens and arboreta.
- City Farmer's Urban Agriculture Notes - A non-profit society that promotes urban food production and environmental conservation.
- Gardeners Club - A directory of all local and national gardening related clubs, societies and organisations in the UK.
- International Code of Nomenclature for Cultivated Plants - An extensive list of worldwide contacts of associations organised in taxonomic order.
- Lesbian Gardens - Special thoughts on growing plants, various links and member information.
- The Brown Lawn Society - Organization encouraging environmentally friendly methods for lawn care such as the reuse of rainwater and natural pest collectors.
- The Garden Club of America - Umbrella organization for US and Canadian local garden clubs. Sites lists clubs and their websites, botanical gardens, pamphlets, and position papers.
- The Mediterranean Garden Society - International society for gardeners in mediterranean climates. History, membership information, journal contents, news, and event listing.
- The Professional Gardeners Guild - An organisation for gardeners employed in private gardens and estates. Based in the UK with members in European countries and the United States.
- Regional (206)