The gardens were absolutely beautiful, with both interior and exterior exhibits. I couldn't take enough pictures! Here is a very brief overview of the exterior gardens. All of these guys grow in D.C.'s toasty Zone 8.
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The gardeners at work outside were a welcoming and friendly group. I pestered with questions about various plants and the care of said plants. Someone in the rose garden suggested a mixture of alfalfa and epson salts to keep the roses happy. She suggested also checking out the United States Botanic Garden site for additional gardening information.