Hardy Palm Trees and Ferns - Showcases plants that can survive the area's often snowy winters. members.aol.com/palmferndc
United States Botanical Garden - The oldest continually operating botanic garden in the United States. Site offers background, event information, gift shop, and related links. www.nationalgarden.org
United States National Arboretum - Contains an array of display gardens, collections, and historical monuments set among native stands of eastern deciduous trees. www.ars-grin.gov/ars/Beltsville/na
