Iris prismatica (Slender Blue Flag Iris)
With a name like Iris prismatica, you know this native iris has to be beautiful. (Iris was the Greek goddess of the rainbow, and "prismatica" means prism-like.) Native to bogs and marshes from Maine to Georgia, Iris prismatica grows from one to three feet tall with exquisite, blue to purple flowers and slender, grass-like leaves and will make a sizable clump given time. Hummingbirds like it, and so will you. Sun. Zones 4-8.