Blue Flag Iris has the most beautiful blue-violet and yellow spring blooms!  It can grow in shallow water or in moist areas along a pond.  I've seen it in drier sites, where it benefits greatly from supplemental water.
 
    Hummingbirds, butterflies, native bees, beetles and other pollinators love Blue Flag Iris.  It's a showy and graceful iris, easy to grow and attractive in a native, wild, water or rain garden.