Planting in moist areas
Thanks for writing! There are several perennials that do great in moist soil. Some of my favorites are gooseneck loosestrife (http://www.bhg.com/gardening/plant-dictionary/perennial/loosestrife/), cardinal flower (http://www.bhg.com/gardening/plant-dictionary/perennial/lobelia/), perennial hibiscus (http://www.bhg.com/gardening/plant-dictionary/perennial/hibiscus/), and astilbe (http://www.bhg.com/gardening/plant-dictionary/perennial/astilbe/). You can find other great choices for your area in our Plant Encyclopedia: http://www.bhg.com/gardening/plant-dictionary/
Good luck. I hope this helps!
---Justin, Senior Garden Editor, BHG.com