Here's a pop quiz for you: Which vegetables are in season right now? Not at the supermarket, but in the countryside a few miles from your home? What can you drive out and pick, fresh off the vine, to eat for dinner tonight?

Photographer Henry Hargreaves and frequent collaborator Caitlin Levin wanted to know, so they documented the calendar of produce as it changes through the seasons in their new series, "Seasonal Food Scans."