My father found these perennial sunflowers under a bridge near Simcoe, if memory serves. He wasn't of the generation of gardeners who had been talked out of wild collection - I have fond memories of long walks in the woods with him for which we were often equipped with plastic bags and a folding latrine shovel, and returned with odd muddy treasures.
We only had to flee an enraged farmer once (in upstate New York), but the consensus in the car as we drove away was that he must have been in a bad mood to start with.
Planting them may or may not have been a mistake - they're invasive in Jville, but still spectacular in fall.

And here's the front garden this morning. Click on image for larger view:
Posted by Patrick at September 14, 2007 10:30 AM