Sweet Corn Planting Timetable

Season and Temperature

• Sweet corn is sensitive to cold and requires mid-spring planting. The seeds won't germinate in soil temperatures under 50 degrees Fahrenheit and seedlings die in frost. Purdue University's Department of Horticulture suggests waiting until 10 days to two weeks after last frost to plant sweet corn.

Growing Season

• Sweet corn cultivars grow in early, mid-season and late varieties. Early varieties mature in 58 to 65 days, mid-season cultivars take 70 to 80 days and late varieties take up to 100 days. All corn requires a frost-free growing season. Plant cultivars according to the length of summer in your region.

Site and Soil

• Choose the right site for corn and amend the soil for effective growing. Plant corn in large plots with full sun exposure, quick drainage and good air circulation. Turn 2 inches of organic compost into the top 6 inches of natural soil to warm it and build a rich, loose foundation. Add 12-12-12 granular fertilizer at planting to encourage quick growth.

Planting, Water

• Plant at least four rows of corn in a box shape to encourage pollination. Push the seeds 1 inch deep, at 8 to 12 inches in the row, and leave 2 to 3 feet between rows. Water the corn with 2 inches of water a week and use mulch to maintain soil moisture and restrict weed growth.