Campanula persicifolia, imo. White form. Lovely garden plant. What is a weed is the Woody Nightshade, Solanum dulcamara, climbing about in the background and the Oxalis. At least in my garden they would be.

Thanks for the ID. I wanted to know before I tackled the weeds in that bed. I am overrun with nightshade and violets. My neighbor to the south thinks nightshade is pretty, my neighbor to the north is too lazy to weed the fence line. It's the first time I've ever had a volunteer appear in my yard that wasn't a weed. Amazing! :-)

Lennie