Association of Professional Landscape Designers

Associated Landscape Contractors of America

Bartlett Arboretum

BioHaven - Floating Islands International

Cornell Cooperative Extension

Institute for Ecosystem Studies

Feng Shui Power

International Society of Arboriculture

Landscaping/Biorganics - Hendrikus Schraven

Mad Gardeners

National Arborist Association

New York Botanical Garden

NY State Turf & Landscape Assoc.

North American Rock Garden Society

Professional Lawn Care Assoc. of America

Stonecleft - Masonry Stone