Kandy Korn Sweet Corn Germination: Prepare the soil with compost or other organic matter. One week after frost or when the soil consistently reaches 60 degrees F, plant the corn 1" deep and 8-12" apart. Planting blocks of four short rows ensures good pollination. Germination should take place in 5-6 days. For companion planting benefits, plant corn with cucumbers, peas, or pole beans; plants that like shade also do well with corn. Avoid planting tomatoes near corn.