If you're not near a refrigerator and you have some harvested corn, keep the freshly picked ears in single layers, rather than stacking them. Corn tends to overheat inside its tight husks, so give each ear as much breathing room as possible. It also helps to cover the ears with a damp cloth. Supersweet varieties have been developed to slow down the conversion of the natural sugars into starch, which makes these varieties last longer on the stalk, and helps them retain their flavor for a few days once harvested. Many seed catalogs claim that supersweet types are twice as sweet at harvesttime as ordinary hybrids, and four times as sweet after 48 hours.
Some people prefer corn that's less sweet, with more texture in each kernel.
They take advantage of the natural conversion process and don't harvest corn until it's somewhat doughy from the increased starch content. They may also wait a day or two to serve it after picking. If you want to store corn over the winter or grind your own cornmeal, give it time to harden completely. This means it has passed through its entire carbohydrate production cycle. It will then contain such heavy starch that it will be too hard to bite and it will keep for many months in storage.