How to Grow Corn
Wikimedia Commons
Corn
Zea mays
vegetableCorn is a tall, warm-season grass crop that produces edible kernels on cobs. It's a staple grain and vegetable grown worldwide for fresh eating, animal feed, and industrial uses. Corn requires warm soil, consistent moisture, and good pollination for optimal kernel development.
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Example Corn timeline · Pittsburgh, PA (Zone 6b)
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Plant Corn
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Corn
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Corn dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-8; can be grown in zones 2-9 with variety selection
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Get my Corn timeline →Growth Stages
Seedling (V1-V3)
1-2 weeksFirst leaves emerge; plant is 2-6 inches tall with visible leaf collar. Root system developing rapidly.
Ensure consistent moisture and warm soil (at least 60°F). Thin to proper spacing if direct seeded. Watch for cutworms and seed corn maggots.
Vegetative Growth (V4-V12)
3-4 weeksRapid leaf and stalk development; plant grows 6-24 inches. Visible node formation and thickening stem. Root establishment continues.
Apply nitrogen fertilizer when plant reaches 6 inches tall. Maintain consistent moisture. Use shallow cultivation to control weeds early. Avoid damaging roots with deep hoeing.
Reproductive Growth (V12-Tassel)
2-3 weeksPlant reaches full height (4-10 feet depending on variety). Tassel visible at top; ear shoots emerge along stalk with silks visible.
Critical watering period—maintain 1.5 inches weekly. Ensure no nitrogen stress. Severe drought or stress at this stage dramatically reduces yield. Support tall varieties in windy areas.
Silking & Pollination (R1-R2)
1-2 weeksSilks emerge from ears and turn brown after pollination. Pollen from tassel falls onto silks. Kernel development begins.
This is the most critical stage for yield. Maintain consistent moisture—any drought stress causes poor pollination. Avoid herbicides near silking time. Pollen viability is lowest in extreme heat.
Grain Development & Maturity (R3-R6)
3-4 weeksKernels fill out and harden. Husk turns brown and dry. Milk stage progresses to dough, then full maturity with hard starch layer.
For fresh eating, harvest at milk stage (R3) when kernels release milky juice. For dried corn or seed, allow to reach full maturity (R6) with hard kernels. Reduce watering as plant reaches maturity.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Bt (Bacillus thuringiensis) spray, crop rotation, remove infested stalks post-harvest, pheromone traps for monitoring
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Apply mineral oil to fresh silks 3-4 days after emergence, Bt spray, handpick larvae, resistant varieties
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Bt spray, insecticidal soap, spinosad, pheromone traps, remove affected plants
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Strong water spray, insecticidal soap, neem oil, beneficial insects (ladybugs, lacewings)
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Increase humidity, mist plants, miticide spray, neem oil, remove heavily infested leaves
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Treat seeds with fungicide before planting, delay planting until soil is warm (>60°F), remove crop debris
Uses
Fresh eating, grilling & cooking
CulinarySweet corn varieties provide tender, flavorful kernels perfect for boiling, grilling, roasting, or eating raw. Peak sweetness occurs within hours of harvest as sugars convert to starch. [source]
Cornmeal, flour & baking
CulinaryDent and flint corn varieties are dried and ground into cornmeal, flour, or polenta for baking bread, tortillas, and traditional dishes. High in carbohydrates and minerals. [source]
Popcorn
CulinarySpecialized popcorn varieties contain moisture that creates steam when heated, causing the kernel to pop. A classic snack rich in fiber and whole grains. [source]
Corn starch & industrial uses
HouseholdCorn starch is extracted for cooking, biodegradable plastics, adhesives, and cosmetics. Corn oil is used for cooking and manufacturing. [source]
Wildlife food & habitat
WildlifeCorn cobs and stalks provide fall and winter wildlife food and cover for birds, deer, and small mammals. Allows ecosystem support while providing harvest. [source]
Harvest Tips
For fresh eating, harvest at milk stage (R3) when kernels release milky juice when pierced—typically 20-30 days after silking. Cob should be green, husk should pull back easily. For dried corn, seed, or popcorn, allow ears to fully mature (R6) on the plant with kernels hard and dent visible, then harvest and dry. Pick in morning after dew dries for best flavor.
Fun Facts
- 🌱 Corn is a wind-pollinated crop, and a single tassel can produce 5-40 million pollen grains. Cross-pollination between nearby corn plants reduces kernel set in isolated plants.
- 🌱 Corn is a grass, not technically a vegetable—its closest relatives are wheat, rice, and bamboo. Sweet corn is selected for early harvest before sugars convert to starch.
- 🌱 The kernels on an ear are always in even-numbered rows due to the plant's genetic spiral growth pattern. Corn has been cultivated for over 9,000 years from wild teosinte in Mexico.
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