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Sweet corn is an annual crop with yellow, white, or bi-colored ears. A long, frost-free growing season is necessary. Here’s how to plant, grow, and harvest corn in your garden. Sweet corn is wind-pollinated, so it should be planted in blocks, rather than in single rows. Early, mid, and late-season varieties extend the harvest, but be mindful: if you miss the optimal harvest time, the corn’s flavor will go downhill fast, as sugars convert to starch.