what is this?
Your mystery plant is a peony, and a very lovely one at that! Some peonies are fragrant; It would be nice if this one is. Peonies are among the old-fashioned deciduous perennials but have had a resurgence in recent years due to the release of new forms. The plant will die to the ground in late fall but will grow again in the spring.Take a look at this article about how to grow peonies: http://www.sunset.com/garden/flowers-plants/how-to-grow-peonies