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Encourages and promotes the development and improvement of hibiscus.
http://www.americanhibiscus.org/
Devoted to exotic, grafted, and garden variety hybrid hibiscus. Many photos and membership information are a click away.
http://www.lonestarahs.org/
Provides an FAQ, background, planting information, and a mailing list.
http://www.trop-hibiscus.com/