American Society-Horticultural - Alexandria, Virginia

The Pennsylvania Horticultural Society - Philadelphia, Pennsylvania

Cedar Horticulture - Easthampton, Massachusetts

Higher Ground Horticulture - New York, New York

Northeast Horticultural Services - Bridgeport, Connecticut

Sterling Horticultural Services - Flanders, New Jersey

Eastern Horticultural Services - Kennett Square, Pennsylvania

Roma Horticulture - Great Neck, New York

Lindenhurst Horticulture Department - Lindenhurst, New York

The Delaware Center for Horticulture - Wilmington, Delaware