ILove2Grow said: I have planted in that area, but those peonies are all accounted for.
In that case, it could easily be a seedling. When did you notice the plant for the first time? This year?
I would wait to see how the plant is going to develop. You have enough time till fall. If the plant looks healthy; that is, with nice leaves without any issues, that might be a seedling. I would wait, monitor and revisit in September or October
