From seed to harvest
A Beginner's Guide to Growing Corn
Learn how to choose, plant, grow, and harvest sweet corn—plus how to protect your crop from common pests and diseases.
Choose your crop
Sweet Corn for the Home Garden
Sweet corn can thrive in a backyard garden when it has warm soil, abundant sunlight, steady moisture, and enough neighboring plants for reliable pollination.
Keep different corn types separated
Sweet corn varieties can cross-pollinate when their tassels shed pollen at the same time. Mixing types too closely may reduce sweetness and create starchier kernels. Separate varieties by distance or choose varieties with different maturity dates.
Corn may be grown for fresh eating, popcorn, flour, animal feed, or ornamental use. For the sweetest flavor, home gardeners generally choose sweet corn.
Sweetness after harvest
Standard sweet corn converts sugar to starch more quickly after picking. Sugar-enhanced and supersweet types retain sweetness longer, making them useful when corn will not be eaten immediately.
Standard Sweet
Classic corn flavor with tender kernels. Best enjoyed soon after harvest because its sugars convert to starch quickly.
Sugar-Enhanced
Sweeter and more tender than standard sweet corn, with improved sweetness after harvest.
Supersweet
Very sweet with excellent storage quality. Requires warmer, consistently moist soil for strong germination.
Timing and technique
Planting Sweet Corn
Direct sow corn outdoors about two weeks after your last spring frost, once the soil has warmed and the forecast is settled.
Wait for warm soil
Plant standard sweet corn at 55°F or warmer. Wait until at least 65°F for supersweet varieties.
Sow in blocks
Plant at least four short neighboring rows instead of one long row. This helps wind-blown pollen reach the silks.
Space correctly
Sow seeds 1 inch deep and 4 inches apart, with rows approximately 3 feet apart. Water thoroughly after planting.
Extend the harvest
Plant an early variety first, then make additional sowings or plant later-maturing varieties for a longer harvest window.
Strong stalks and full ears
Caring for Your Corn
Water and spacing
- Thin seedlings at about 4 inches tall, leaving plants 8–12 inches apart.
- Keep the soil consistently moist, especially during tasseling and ear formation.
- Mulch around plants to conserve moisture and suppress weeds.
- Weed carefully; corn has shallow roots that are easily damaged.
Soil and feeding
- Choose fertile, well-drained soil with a pH around 6.0–6.8.
- Prepare the bed with compost or a balanced fertilizer before planting.
- Because corn grows quickly and feeds heavily, fertilize according to product directions during the season.
- Water well after applying fertilizer.
Pollination tip: Poorly filled ears often indicate incomplete pollination. A compact block of corn and adequate moisture during silking greatly improve kernel development.
Pick at peak sweetness
When to Harvest Corn
Sweet corn is generally ready about 20 days after the silks first appear.
Signs your corn is ready
- Silks have turned brown and begun to dry.
- Ears feel full and rounded beneath the husk.
- A punctured kernel releases a milky liquid rather than clear fluid.
How to pick
Grasp the ear firmly, pull it downward, and twist it away from the stalk. Cool or prepare standard sweet corn soon after harvest for the best flavor.
Protect your crop
Common Corn Pests & Diseases
Regular inspection, crop rotation, garden cleanup, and correct planting conditions are the best first line of defense.
Corn Earworm
Larvae feed on silks and kernels. Monitor ears as silks emerge and follow current labeled control recommendations where needed.
European Corn Borer
Larvae bore into stalks and ears, leading to broken tassels or bent stalks. Remove infested residue and monitor plants closely.
Corn Sap Beetles
Adults and larvae damage ripe kernels. Harvest promptly, plant resistant varieties, and remove crop debris.
Root Aphids & Seedcorn Maggots
Root aphids can stunt and yellow plants, while maggots damage germinating seed—especially in cold, wet soil.
Raccoons
Raccoons target ripening ears. A properly installed electric fence or other wildlife exclusion is usually the most reliable defense.
Stewart's Bacterial Wilt
Young plants may wilt or become stunted, with yellow-brown streaks on leaves. Choose resistant varieties, rotate crops, remove residue, and manage flea beetles.
Corn Smut
Gray-white galls form on ears or tassels, darkening and releasing spores as they mature. Remove galls before they rupture and rotate crops to reduce future pressure.
How to Grow Corn
Printable seed-to-harvest guide.
Corn Pests & Diseases
Printable problem-solving guide.
