The leaves in your pics look kind of more jaggedy than I remember them, but I'm pretty sure it's obedient plant, Physostegia virginiana, and that is definitely "known" to SPREAD! If you "move" the individual flowers back and forth on the stem (or else it's up and down--never can remember for sure!), do they stay where you move them to??? If it's being "obedient," it's definitely OBEDIENT plant!

;-)
Skybird

P.S. If that's what it is, I think I know what somebody's gonna be giving away at a swap soon!!!

That looks like Scrophularia macrantha "redbirds in a tree" to me. I have seen it's cousin, "Bunny in the grass" which has bronzy-green flowers instead of pink/red.

I have never seen Physostegia virginiana before though.

I've never grown that, but the leaves sure do look more right! And I think there should be more flowers on the stem for Physostegia too--have never grown that one myself either because it can spread so much! The only red-birds-in-a-tree I've ever seen blooming was an "unusual" one Kelly had that was low and spreading and had very tiny flowers, but this bigger one looks right to me! I think you may have won the prize, Zach!

Skybird

P.S. I didn't think of this before, but Physostegia is in the mint family and has square stems! That should make it easy to identify.

I know it's not Obedient plant. I don't think it's Redbirds in a Tree either. I think it's some sort of Salvia.

Are the stems square? Salvia is in the mint family and has square stems too.

The flowers on the stems don't really look "dense" enough to me for it to be Salvia.

Skybird is likely right. I think it is redbirds in a tree. I had no idea it would be so big or tough.