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Planting, Growing, and Harvesting Sweet Corn How do we grow the sweet corn of our dreams?full, juicy, and oh-so-delicious? It?s disheartening when there are gaps left in our cobs? kernels. Corn needs to be planted properly for optimal pollination. Here?s how to plant, grow, and harvest sweet corn in the garden. About Sweet Corn Sweet corn is a tender, warm-season annual crop that produces ears of yellow, white, or bi-colored kernels. Native to the Americas, sweet corn has been cultivated for thousands of years; it?s famous as one of the Three Sisters?corn, beans, and squash?grown by Native Americans. A long, frost-free growing season (60 to 100 frost-free days) is necessary to grow and harvest corn. Don?t be tempted to sow too early, though. Mid to late spring is just fine once any chance of frosts is long gone. And corn is a grass! A member of the Poaceae family, corn relies on wind, not bees or insects, to pollinate its flowers. This is why we plant corn in blocks of short rows instead of long, single rows.