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"Sweet corn" is a variety of

"Sweet corn" is a variety of corn so that won't change. However, the corn turns from sugar to starch very quickly (within 24 hours). This is why the old adage was "start the water boiling, run to the patch, pick and husk the corn, run back to the pot, cook the corn, and eat or process immediately." Put corn in the refrigerator right away to keep it cool, not on the counter. If you can't eat corn from the garden, try to eat it within 24 hours of being picked. If that's not feasible, eat within a day or two.