That looks a lot like balsam impatiens. If it is, it should bloom pretty soon and you'll know for sure.

Lynda

It's an evening primrose of some kind.

It looks like the balsam impatiens in my beds. Reseeds each year, I just tidy up the patch (pulling strays that have gone way too far, like into the middle of my blackberry lily patch)and off it goes blooming. I like it. I like anything that will flower in this shady spot under a fig tree!