The Brown Lawn Society - - Organization encouraging environmentally friendly methods for lawn care such as the reuse of rainwater and natural pest collectors.
Canadian Botanical Conservation Network - - A registered charitable organization which helps conserve biological diversity through networking tools and conservation programs for botanical gardens and arboreta.
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.
Gardeners Club - - A directory of all local and national gardening related clubs, societies and organisations in the UK.
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.