Looks like cutleaf Toothwort (Dentaria laciniata but perhaps they have renamed it to Cardamine concatenata). What a nice plant! It may go dormant later in the year (mine do, but not sure about in Indiana), so you could mark where it is just in case (so you don't plant something on top of it). Here is a link that might be useful: USDA profile for cutleaf toothwort

Reseeds in gardens here, even naturalized to a limited extent - even approaching the edge of a freeway south of Seattle. So, it may pop up here and there in your area also.

Found the Name that plant forum :) and posted my query there. http://forums2.gardenweb.com/forums/namegal/?32146 Please pardon me being a noob and posting here :)

Yes, the most common cause of purple leaves and stems is lack of P, but fertilizing the plants directly via the roots isn't going to help. What you need to do is to spray the foliage, which avoids root uptake, which is the problem. You can use dilute blue stuff, like MG or Peters and the like or use a few drops of liquid concentrated fish or seaweed emulsion in some water. I don't do anything b'c I know that the plants will grow out of it, but for many, just the sight of those purple plants is cause for concern. Spraying the foliage works, and it will green up the plants, but only b/c you're bypassing root uptake, which is the major problem and it's worse if the temps are too low and temps alone can also do it. Carolyn