- American Hibiscus Society
Includes membership information, publications, chapter locations, events, and links.
- 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.
- The Violet Society
Dedicated to Wild and Sweet Violets. Information on sources of plants, seeds, gifts, books, art and crafts.
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