- Alpine Garden Society
- American Begonia Society
- American Clematis Society
- American Conifer Society
- American Daffodil Society
- American Fern Society
- American Hemerocallis Society
- American Hibiscus Society
- American Hosta Society
- American Hydrangea Society
- American Iris Society
- American Ivy Society
- American Primrose Society
- American Rose Society
- Bromeliad Society International
- Cactus and Succulent Society of America
- Cyclamen Society
- Gesneriad Society
- Hardy Fern Foundation
- Herb Society of America
- Heritage Rose Foundation
- Home Orchard Society
- International Carnivorous Plant Society
- International Lilac Society
- Magnolia Society International
- New England Wild Flower Society
- North American Lily Society
- North American Rock Garden Society
- Organic Seed Alliance
Plant Societies
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