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United States National Arboretum, Washington

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Contact: +1 202 245 2726
Open Hours: Daily 8a-5p
Best known for its vast collection of azaleas, (Washington's favorite porch-flower), this 444-acre (180-hectare) garden park has much else to offer. Fountains, pools and open space separate a series of focused gardens at United States National Arboretum. The National Bonsai Collection, a gift from Japan, is a fascinating exhibit of tiny trees. Other notable sections are the aquatic garden (filled with lotuses of many varieties) and the National Herb Garden.