I did so much Blackberry picking when I was a kid. Free stuff, doomed to dry out and fall off it's tree-perch, unless you, the hero picks and eats it! And weren't they ALWAYS growing in abundance in some walled off wasteland, or bit of somewhere that you couldn't quite get to?!
We went picking in a big wasteground by the American School today, and in Roma they get to pick wild figs too!!! Really! We got a ton, and they were the best fresh figs I have ever tasted! YUM!