Hibiscus coccineus, Scarlet Rosemallow  is a SE native to marshes and swamps so it grows best in average, medium to wet soil in full sun to light shade. It typically grows woody stalks 5-8' tall and features large, showy, 5-petaled, bright scarlet red flowers (3-5" diameter) over a long, mid-summer to early fall bloom period. These flowers are attractive to hummingbirds, butterflies and bees, including the specialized bee Ptilothrix bombiformis (hibiscus bee).
 
Exotic to NC, but native to SE U.S. Click to see it's range in SE U.S.
 
More info here