Looks like a Hesperus ("Dame's Rocket") (Hesperus Matronalis) .

Thanks so much duluththinbloomz4! I do believe you're correct! Dames Rocket..... that's interesting...... Agressive little buggers! Wow just read that they are even considered invasive!

Resembles Spring Phlox to me. What do the flowers look like?

Are yours spreading or are you just reading about Dame's rockets and thinking that that is what you have? Phlox does spread easily but no where as much as DRs.

In my opinion the OP's plant is Hesperis matronalis, Dames Rocket. emerogork, your picture also shows Hesperis matronalis. Did you post it as an example of that species? Or is it what you call 'Spring Phlox'.