Links
- Georgia Green Industry Association
- JC Raulston Arboretum at NC State University
- Maryland Nursery and Landscape Association
- Noble Plants ( Dr. Michael A. Dirr's Plant Information Page)
- North Carolina Association of Nurserymen
- Ohio Nursery and Landscape Association
- Southern Nursery Association
- Texas Nursery and Landscape Association
- The State Botanical Garden of Georgia
- University of Georgia
- USDA Hardiness Zone Map
- Virginia Nursery and Landscape Association