Alpine Garden Society

American Bamboo Society

American Bonsai Society

American Clematis Society

American Daffodil Society

American Fern Society

Gloxinia & Gesneriad Society

American Hemerocallis Society

American Hibiscus Society

American Horticultural Society

American Hosta Society

American Hydrangea Society

American Iris Society

American Ivy Society

American Primrose Society

American Rose Society

A. Society-Horticultural Science

Androsace Group

Aril Society International

Bromeliad Society International

Cactus & Succulent Society of A.

Cottage Garden Society

Cyclamen Society

Erodiums

Friends of Trees

Hardy Fern Foundation

Hardy Plant Society, England

Herb Society of America

Holly Society of America

Home Orchard Society

International Aroid Society

International Bulb Society

Int. Carnivorous Plant Society

International Clematis Society

International Geranium Society

Int. Water Gardening Society

National Chrysanthemum Society

National Gardening Association

NorthAmerican Butterfly Association

North American Dianthus Society

North American Heather Society

North American Lily Society

NorthAmerican Rock Garden Society

Perennial Plant Association

Sedum Society

Species Lily Preservation Society

Royal Horticultural Society

Weed Science Society of America