We have a very active Garden Club--they do a wonderful job of beautifying our Uptown every year. There are flowers everywhere. Petunias are the most common flower they use: I assume because they are very hardy. These little stragglers are a common sight. Last year's seeds seem to find the barest, most desolate spots to take root. A couple of years ago we had a dozen or better Butterfly bushes take root next to the store where I work.I have no clue where those seeds came from but I brought a start home and added it to my growing collection of flowers and plants. One of these days I'm going to run out of room!