New Ornamentals Society
Devoted to the study of new and rare ornamental landscape plants. Includes an online source guide and plant encyclopedia.
The International Geranium Society
Society for the enjoyment of plants in the geraniaceae family centered in California. Events, information about membership and the magazine, culture tip sheets, and a photo gallery.
The Geraniaceae Group
An international horticultural club interested in the species of all the genera of the Geraniaceae Family.
Hebe Society
International society based in Britain promoting the cultivation and conservation of hebes and other New Zealand native plants. Includes plant profiles and photos, FAQs, and links.
American Ivy Society
A non-profit organization dedicated to preserving the genus Hedera through education and promotion. Site offers contact information, species photos with descriptions, a classification system, care instructions, article collection, membership details, and a question answering resource.
Passiflora Society International
Dedicated to the preservation, study, and dissemination of Passiflora.
Scottish National Sweet Pea Rose & Carnation Society
Society home page with Sweet Pea and Rose trial results, flower show venue and reports.
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