In the Arboretum's Butterfly Garden you will find a row of Hibiscus syriacus 'Aphrodite' or commonly known as Rose of Sharon full of blooms to entice all pollinators. This shrub can also be found at the U.S. National Arboretum in Washington, D.C. where it and two other types are described as "The elegant floral display of these bewitching flowering shrubs belies their rugged constitution. In the fiery forge of summer sun and heat, 'Aphrodite', 'Helene', and 'Minerva' prove their mettle with excellent dark green foliage and continuous flowering until felled by autumn’s frost."
Click on this link for the National Arboretum website to view pictures and additional growing information.