Do a google search for specialty crops and illinois. There is all kinds of information out there. Broomcorn, red clover seed, peas and beans, mellons and squash are all listed. Popcorn, too. I have a friend that contracts with a local grocery chain for sweet corn. I know of another family that plants organic sweet corn. They plant one acre, then two weeks later another acre, and two weeks after that another acre. When it is almost ready, they put out a sign by the highway that it will be ready in a week. On opening day, it is a mad house. They sell an entire acre in a weekend or two at most. Then they change the signs for the next batch. All they put into it is three weekends in the spring, water it all summer, and 4 or 5 weekends towards the end of summer.