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..
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..
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