United States National Arboretum and National Bonsai and Penjing Museum (Friends of the National Arboretum)

United States Botanic Garden

Tudor Place Historic House & Garden

Hillwood Estate, Museum & Gardens

Winterthur Museum, Garden & Library

University of Delaware Botanic Gardens

Delaware Center for Horticulture

New Britain Youth Museum & Hungerford Nature Center

Hollister House Garden

Greenwich Botanical Center