Peter,
I pass a scruffy spot of ground along a commercial road every morning. And every morning I am amazed at what has chosen to survive. Last week there were yellow and white wild flowers. This week purple and blue. I wonder who threw down the original seeds and how long ago. This was all farmland once. I have visions of some calico clad housewife hoping to add a little color to her garden tossing out a few seeds. Wouldn't she be surprised at what she accomplished?
SS