It is Rose of Sharon shrub, Hibiscus syriacus. It is a bit of a pest farther south in New England, seeding around with enthusiasm, though not as badly as burning bush. In my area it is marginally hardy and the seeds don’t typically mature after the late season bloom.

Is it really?! Never would have thought that! Thanks, Babs. I will remove it then. I have noticed that they do have the tendency to be aggressive around here. And if you notice in the picture unfortunately there is a row of burning bushes there already (neighbor's, not mine). Plus it's in my yellow/orange/red bed, lol, and I'm sure it will be pink or white. Anywhere else in the yard and it might have stayed! I'm just trying to think where it might have come from. No Rose of Sharons in the immediate area.... although the funny thing is I just remembered that my neighbor used to have some, but now they are gone. I don't remember seeing them for some years now....

Thank you for the ID!

:)
Dee