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There are a number of iris that will work including Louisiana iris. Yellow flag iris will do well but is very aggressive in a situation where the soil stays damp. Deciduous hollies have brilliant red berries all winter and will thrive in this spot.
You can get some good information on them via this link.
Just make sure not to site large trees such as river birch or Bald cypress close to your house or another structure as they can become quite large. The shrubs like Itea, Inkberry holly, and perennials such as Japanese Iris (Iris kaempferi) and Lobelia cardinalis (Cardinal flower) will work well.
I forgot to mention a native shrub called Buttonbush (Cephalanthus occidentalis).