American Hemerocallis Society
American Horticultural Society
American Rose Society
American Society of Irrigation Consultants
Aquatic Gardeners Association
Associated Landscape Contractors of America (ALCA)
Association of Professional Landscape Designers
Canadian Society of Landscape Architecture
Garden associations
International Society of Arboriculture (ISA)
MALTA - Metro Atlanta Landscape & Turf Association
Michigan Nursery and Landscape Association Okemos, MI (USA)
North American Plant Preservation Council
Professional Lawn Care Association of America (PLCAA) Okemos, MI (USA)
Ontario Horticultural Association
Pennsylvania Horticultural Society
Spanish Association of Park and Public Gardens
Virginia Landscapes