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 - A 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.