1. Hampton Roads Agriculture Research and Extension Center, Virginia Tech, Virginia Beach, Virginia, USA
2. North Carolina Department of Agriculture and Consumer Services, Plant Industry Division, Raleigh, North Carolina, USA
3. North Carolina Department of Agriculture and Consumer Services, Plant Industry Division, Dobson, North Carolina, USA
4. North Carolina Department of Agriculture and Consumer Services, Plant Industry Division, Boone, North Carolina, USA
5. North Carolina University Cooperative Extension, Morganton, North Carolina, USA
6. Long Island Horticultural Research and Extension Center, Cornell University, Riverhead, New York, USA
7. USDA-ARS, U.S. National Arboretum, Floral and Nursery Plants Research Unit, Beltsville, Maryland, USA