I have a friend who just bought an older house in Northern/Central Indiana, and these are coming up all over the garden beds through the weed-protecting fabric. She's not sure if it is a weed or an intentional plant.
Commented on May 04, 2012
a weed is a plant out of place! i have creeping jenny, which i like, as a ground cover, most
people don't even want it on the place, as it takes over. but that is what i grow it for. so, a weed is like beauty, all in the eye of the beholder. i vote for evening primrose, buttercups are yellow.