How to Grow Sweet Corn
Zea mays
Sweet corn is a beloved warm-season staple known for its sweet kernels and versatile culinary uses. Gardeners grow it to enjoy fresh summer harvests that pair perfectly with grilled meats or salads.
📷 Wikipedia: Sweet cornStarting Sweet Corn: indoors or direct sow?
🌾 Sow directly in the garden — Sweet Corn is not usually started indoors.
Sweet corn is direct-sown only after the last frost; do not start indoors or transplant seedlings as cold soil damages roots.
Soil, care & harvest
Prepare loose, fertile soil with a pH between 5.8 and 7.0. As a frost-sensitive crop, you must wait until after the last spring frost when the ground is warm. Sow seeds directly into rows at a depth of one to two inches. Expect germination within four to ten days under these ideal conditions.
Space plants eight to twelve inches apart in rows to ensure proper air circulation and pollination. While corn does not require trellising, consistent moisture is vital; water moderately but heavily during tasseling. Apply mulch around the base to retain soil warmth and moisture, feeding regularly if growth slows.
Watch for common pests like corn earworms and diseases such as gray leaf spot; prevention involves crop rotation and monitoring plants daily. Harvest ears when kernels are milky and tender, typically occurring between sixty and one hundred days after planting. Cut the stalks at the base to preserve quality.
When to Plant Sweet Corn
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | — | July – August | October – August |
| Zone 2 | — | June – August | September |
| Zone 3 | — | June – July | September – October |
| Zone 4 | — | June – July | August – October |
| Zone 5 | — | May – June | August – October |
| Zone 6 | — | May – June | August – September |
| Zone 7 | — | April – June | July – September |
| Zone 8 | — | April – May | July – August |
| Zone 9 | — | March – April | June – July |
| Zone 10 | — | February – April | May – July |
| Zone 11 | — | January – March | April – June |
| Zone 12 | — | January – March | April – June |
| Zone 13 | — | January – March | April – June |
