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American Brugmansia and Datura Society
Offers culture information, searchable plant database, registry and photographs.

American Hibiscus Society
Includes membership information, publications, chapter locations, events, and links.

Georgia Perennial Plant Association
Organization of perennial gardeners in the state of Georgia presents information on meetings and membership, a featured plant section, and photo galleries.

International Lilac Society
Formed in 1971 to stimulate interest in the genus Syringa and to promote its use in public and private landscaping.

National Chrysanthemum Society
Promotes the propagation and cultivation of the chrysanthemum and increase the bonds of fellowship among growers of the chrysanthemum.

Ranunculaceae Society
Society based in Ireland focusing on gardening with plants in the buttercup family. Information about activities, publications, and membership, photo gallery, and plant of the month feature.

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