(DC) (Friends of the National Arboretum) Enjoy spring at the U.S. National Arboretum during FONA's Flowering 5K. This run or walk will take you past garden collections brightly colored with spring flowers, over tree-lined rolling hills, and along streams winding their way to the Anacostia River. Enjoy cherry blossoms, magnolias, and so much more! This race is not only scenic ...