If you live near corn-producing areas, then that might make sustainable sense, although I question burning a food source. But corn is renewable compared to trees an coal, as long as you don't cut down forests to grow the corn. The town next to my old town had a corn silo for all the people who had corn stoves. This was right outside of Washington, DC, not out in Iowa! Smelled like popcorn in the winter.
I have a stove that burns coal and wood. Next winter I will burn both if I can find a source for high-quality anthracite coal. Such coal comes from Pennsylvania, as I understand it. While not right down the street, it does get delivered by train. Anthracite burns very slowly and very hot, and you don't need much in a small stove. Renewable it is not, however.