Although Minnesota has very long, very cold winters, growing sweet corn during the growing season is not difficult. By choosing the right planting time and properly preparing your garden soil, you can ensure good corn production in your home garden. In addition to working the soil, you will need to fertilize your corn and to water it regularly as it grows. Natural, organic fertilizers work well for growing sweet corn in Minnesota.
Dig and turn the soil in your corn bed with a shovel down to 18 to 24 inches.
Break up any clumps larger than a golf ball with your hoe or a rake.
Mix 2 or 3 inches of compost or composted manure in with your soil.
Smooth the soil out and form your rows 30 to 36 inches apart by mounding the soil up about 8 inches.
Plant your corn kernels, or seeds, as soon as the soil temperature reaches 50 degrees F. Plant your corn 1 inch deep with several kernels per hole. Cull excess plants by removing weaker plants while they are young. Plant your corn 8 to 12 inches apart.
Keep your corn moist. Water whenever you feel the soil below the top 1/2 inch dry out. Water, if possible, with a soaker hose to help keep the water near the ground and prevent evaporation. Watering with a soaker hose will also help prevent common fungal problems that can occur when too much water stands on the leaves of the corn plants.