This season I will be renting an additional 20x60 garden spot next to the one I had last year, the new spot was part of a hay field last year. What is the best way to control weeds in the new spot? Last year someone had the same spot and I tilled it for them early in the spring, they planted their corn and the weeds/hay just choked out the corn. I don't want that happenning to me. How much seed will I need for a 20x60 spot? Does anyone have a recomendation on a heirloom sweet corn to plant?