This is a weed, ground cover. The leaves look like maple. Green. Can you tell me what it is?
It is a red maple seedling. I just pulled one from my garden about the same size. Once the keys fall, they must find some moist ground (or pot of flowers) to germinate. As an aside, every few years I get squirrels that have been taught they are good to eat. I get far fewer seedlings in those years. This, thankfully, is one of them :)