» Canadian Botanical Conservation Network
   A registered charitable organization which helps conserve biological diversity through networking tools and conservation programs for botanical gardens and arboreta.
   http://www.rbg.ca/cbcn/

» City Farmer's Urban Agriculture Notes
   A non-profit society that promotes urban food production and environmental conservation.
   http://www.cityfarmer.org/

» Gardeners Club
   A directory of all local and national gardening related clubs, societies and organisations in the UK.
   http://www.gardenersclub.co.uk/societiesinfo.asp

» International Code of Nomenclature for Cultivated Plants
   An extensive list of worldwide contacts of associations organised in taxonomic order.
   http://www.ishs.org/sci/icralist/icralist.htm

» Lesbian Gardens
   Special thoughts on growing plants, various links and member information.
   http://lesbiangardens.net/

» The Brown Lawn Society
   Organization encouraging environmentally friendly methods for lawn care such as the reuse of rainwater and natural pest collectors.
   http://www.brownlawnsociety.org

» 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.
   http://www.gcamerica.org/

» The Mediterranean Garden Society
   International society for gardeners in mediterranean climates. History, membership information, journal contents, news, and event listing.
   http://www.mediterraneangardensociety.org/

» 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.
   http://www.pgg.org.uk/