- Flowers & Plants Association
 - Promoting cut flowers and indoor plants in the U.K. Includes care tips, pictures, industry information, and a list of retailers in the U.K. - Society for Economic Botany (SEB)
- Encourages scientific research, education, and related activities on the past, present, and future uses of plants, and the relationship between plants and people.
- PlantAmnesty
- Hopes to end mal-pruning and improper landscape management practices, and to promote awareness and respect for plants as an integral part of our urban ecology.
- National Chrysanthemum Society
- Includes information about the annual convention and show.
- International Bulb Society
- Provides information on the growing, conservation and botany of bulbs such as amaryllis, tulips, and hyacinth.
- Canadian Peony Society
- Contains membership information and newsletter.
- International Lilac Society
- Aims to promote and stimulate interest in the genus Syringa.
- Canadian Ornamental Plant Foundation (COPF)
- Nonprofit organisation that helps fund new ornamental plant development.
- American Clivia Society
- Bring together individuals interested in keeping, collecting, and caring for any of the six species and interspecific crosses of Clivia.
- Pachypodium.org
- Dedicated to the preservation and cultivation of the Pachypodium species.
- Australian Plants Society (SGAP Victoria)
- Hints on growing Australian native plants, where to see Australian plants growing, a diary of events, and extracts from the APS Newsletter.
- Canadian Begonia Society
- International Violet Association
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