How to Grow Corn (Maize)
Wikimedia Commons
Corn (Maize)
Zea mays
vegetableCorn is a tall, warm-season annual grass crop that produces large kernels on cobs enclosed in husks. It is one of the world's most important food crops, used for human consumption, animal feed, and industrial products. Corn requires warm temperatures, adequate moisture, and rich soil to thrive.
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Example Corn (Maize) timeline · Pittsburgh, PA (Zone 6b)
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Plant Corn (Maize)
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 (Maize)
Around Jun 16≈ 60 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9; prefers warm climates (zones 5-8 for best yields)
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Get my Corn (Maize) timeline →Growth Stages
Seedling
2-3 weeksFirst leaves emerge within 7-10 days; young plant develops 2-3 true leaves and a small root system.
Keep soil consistently moist but not waterlogged. Thin to proper spacing once plants have 2-3 true leaves. Avoid heavy nitrogen at this stage to prevent weak growth.
Vegetative Growth
4-6 weeksPlant rapidly grows in height and leaf number (V1 through V-stage); develops deep root system and side shoots. Reaches 3-5 feet tall depending on variety.
Apply nitrogen fertilizer or side-dress when plants are 12-18 inches tall. Keep area weed-free to reduce competition. Support tall varieties if needed in windy areas.
Tassel and Silking
2-3 weeksTassel emerges from top of plant (male flowers); silks emerge from ears a few days later (female flowers). This is the critical pollination window.
Ensure consistent watering—drought during this stage severely reduces yield. Do not disturb plants during pollination. Silks will brown naturally as kernels develop.
Kernel Development (Milky to Dough Stage)
3-4 weeksKernels fill with starch; ears become heavier and kernels progress from milky (soft, liquid) to dough (soft but firm) stage.
Continue regular watering. Watch for pest damage (corn borers, birds). Stop fertilizing. Ears are ready for fresh eating at milky stage; dough stage is for field corn.
Maturity and Harvest
1-2 weeksKernels become hard and dent at the crown (dent stage); husks dry and brown. Plant naturally senesces if left standing.
For sweet corn, harvest when silks are brown and kernels yield milky juice when pierced. For field corn, allow to dry to 15-20% moisture before harvest. Handle ears carefully to avoid breakage.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Use Bt (Bacillus thuringiensis) spray; plant resistant varieties; remove plant debris; encourage beneficial parasitoid wasps.
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Apply Bt when silks emerge; hand-pick larvae; use pheromone traps; encourage natural predators like parasitoid wasps.
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Crop rotation (do not plant corn in same spot for 2+ years); use resistant hybrids; apply beneficial nematodes or soil insecticides if severe.
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Use row covers on seedlings; apply diatomaceous earth around base; remove weeds and debris; introduce parasitoid wasps.
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Spray Bt; use pheromone traps to monitor; hand-pick if populations are low; encourage parasitoid wasps and ground beetles.
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Spray water forcefully to dislodge; use neem oil if severe; maintain adequate soil moisture to reduce stress.
Uses
Fresh sweet corn and cooked kernels
CulinarySweet corn varieties are prized for their tender kernels and high sugar content when eaten fresh, boiled, grilled, or roasted. Fresh corn is a summer vegetable staple in many cuisines worldwide. [source]
Popcorn and cornmeal staples
CulinaryPopcorn varieties expand when heated due to moisture inside the kernel. Field corn is dried and ground into cornmeal, corn flour, and polenta for baking and cooking. [source]
Corn oil and industrial use
HouseholdCorn oil is extracted from corn germ and used for cooking and salad dressings. Corn starch is used in cooking, baking, and as a thickening agent. [source]
Dried corn decorations and crafts
CraftDried corn cobs, husks, and kernels are used for fall decorations, wreaths, and craft projects. Corn husks can be used to make tamales or woven into decorative items. [source]
Wildlife food source
WildlifeCorn is an important food source for birds, squirrels, deer, and other wildlife. Leaving some mature ears unharvested provides fall and winter forage. [source]
Harvest Tips
Sweet corn: Pick ears when silks are brown and kernels release milky juice when pierced (usually 20-24 days after silking). Harvest in early morning for best sugar content. For popcorn and field corn, allow ears to dry thoroughly on the plant until husks are papery brown and kernels are hard and dent slightly at the crown. Store in cool, dry location.
Fun Facts
- 🌱 Corn produces both male flowers (tassels) at the top and female flowers (silks) on the ears; each silk is connected to a single kernel, so every kernel that develops must be pollinated individually.
- 🌱 A single corn plant can produce 200-500 kernels, and a mature plant's root system can extend 4-5 feet deep and spread 3-4 feet wide to access water and nutrients.
- 🌱 Corn is a C4 plant, meaning it uses an especially efficient photosynthetic pathway that allows it to thrive in hot, sunny conditions and convert sunlight to biomass more efficiently than C3 plants.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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