- African Violet Society of America
- American Society for Horticultural Science
- American Bamboo Society
- American Begonia Society
- American Bonsai Society
- American Boxwood Society
- American Camellia Society
- American Conifer Society
- American Daffodil Society
- American Dahlia Society
- American Daylily Society
- American Fern Society
- American Fuchsia Society
- American Gourd Society
- American Hibiscus Society
- American Horticultural Society
- American Hosta Society
- American Hydrangea Society
- American Iris Society
- American Ivy Society
- American Orchid Society
- American Penstemon Society
- American Primrose Society
- American Rhododendron Society
- American Violet Society
- Azalea Society of America
- Ball Horticultural Company
- Bromeliad Society International
- Cactus and Succulent Society of America
- Cryptanthus Society
- Cycad Society
- Cymbidium Society of America
- Epiphyllum Society of America
- Garden Writers Association
- Gesneriad Society
- Hardy Fern Foundation
- Hardy Plant Society
- Heather Society
- Historic Iris Preservation Society
- Holly Society of America
- International Aroid Society
- International Geranium Society
- International Palm Society
- International Waterlily & Water Gardening Society
- National Chrysanthemum Society
- North American Gladiolus Society
- North American Rock Garden Society
- Pacific Bulb Society
- Plumeria Society of America
- Sedum Society
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Topic revision: r4 - 27 Apr 2024, DougChyz
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