Other Hardy Plant societies & groups:

• The Hardy Plant Society - Connecticut Chapter
• The Hardy Plant Society - Great Lakes Chapter
• The Hardy Plant Society Mid-Atlantic Group
• Wisconsin Hardy Plant Society
• Willamette Valley Hardy Plant Group
• Northwest Perennial Alliance
• Vancouver Hardy Plant Group
• Hardy Plant Group of the Victoria Horticultural Society
• The Hardy Plant Society of Great Britain
• The Hardy Plant Society - Hertfordshire Group
• The Hardy Plant Society of Washington
• Salem Hardy Plant Society

Other horticulturally focused societies, clubs & groups:

• Alpine Garden Society
• American Bonsai Society
• American Conifer Society
• American Daffodil Society
• American Fern Society
• American Hemerocallis Society
• American Hibiscus Society
• American Horticultural Society
• American Hosta Society
• American Hydrangea Society
• American Iris Society
• American Ivy Society
• American Penstemon Society
• American Peony Society
• American Primrose Society
• American Rhododendron Society
• American Rhododendron Society, Portland Chapter
• American Rose Society
• American Society for Horticultural Science
• Androsace Group
• Association of Northwest Landscape Designers
• Audubon Society of Portland, Oregon
• Bromeliad Society International
• Cactus and Succulent Society of America
• California Rare Fruit Growers
• Cottage Garden Society
• Cyclamen Society
• Hardy Fern Foundation
• Holly Society of America
• Home Orchard Society
• International Aroid Society
• International Carnivorous Plant Society
• International Waterlily and Water Gardening Society
• Japanese Garden Society of Portland OR
• Mediterranean Garden Society
• National Chrysanthemum Society
• National Gardening Association
• Native Plant Society of Oregon
• North American Butterfly Association
• North American Lily Society
• North American Rock Garden Society
• Oregon Mycological Society
• Oregon State Federation of Garden Clubs
• Pacific Northwest Peony Society
• Perennial Plant Association
• Portland Rose Society
• Puget Sound Mycological Society
• Royal Horticultural Society
• Scottish Rock Garden Club
• Society for Pacific Coast Native Iris
• The Garden Conservancy
• The Gesneriad Society
• Victoria Horticultural Society
• Washington Native Plant Society
• Weed Science Society of America