Is this a Weed?
I have been cleaning up some neglected areas of my borders and I had this plant growing rather purposefully on either side of the front walk. I've let it grow - thought maybe it was a feverfew or something. It finally popped out little buds and they ended up with extremely tiny little flowers with a few yellow petals that just rather stop after a bit and never get to be anything. I am thinking I've been cultivating a weed - what one is it?
I'm located in central Illinois between St. Louis, MO and Springfield, IL.