Hungry? Here's a Map of Every Urban Plant You Can Snack On

Last summer, Ethan Welty stopped buying fruit. He didn't need to pay for it anymore: he could pick nearly everything he needed from the trees on the streets of Boulder, Colorado.

At first, he scanned the canopy for apples to use in his home-brewed beer. But there was more. Hanging in the sidewalk foliage were peaches, apricots, walnuts, mulberries and plums. And so Welty, a PhD student researching glacier movement, began to map the urban orchard.