Sweet Corn Growing Guide

This Sweet Corn Growing Guide will help you grow tender, flavorful ears perfect for fresh eating. Sweet corn varieties vary widely in sweetness, shelf life, and growing requirements, so choosing the right type is important. This guide covers planting, spacing, watering, fertilizing, harvesting, and how to manage cross-pollination between different sweet corn types.

Quick Overview

Category	Details
Planting Time	Spring after frost
Soil Temperature	60–95°F (65–85°F ideal)
Sunlight Requirements	Full Sun (8+ hours)
Watering Requirements	1–2" per week
Spacing (In-Ground)	Rows: 30–36", Plants: 8–12"
Spacing (Raised Bed)	8–12" apart in blocks
Fertilizer Guidelines	Heavy feeder – nitrogen throughout season

Growing Guide Details

Plant Classifications

Sweet corn varieties are grouped by the genes that control sugar content and sweetness.

Standard Sweet (SU): Traditional sweet corn with classic corn flavor. Best eaten soon after harvest.

Sugary Enhanced (SE): Sweeter and more tender than standard sweet corn while still maintaining strong germination and vigor.

Supersweet (SH2): Extremely sweet corn with long shelf life after harvest. Kernels are crisp and sugary but seeds require warm soil for best germination.

Triple Sweet: Hybrid types that combine SE and SH2 genetics to produce very sweet corn with strong germination and good flavor balance.

Because these corn types can cross-pollinate, gardeners should isolate certain varieties or stagger planting times to maintain sweetness and kernel quality.

What Variety to Choose?

💡

• Silver Queen: Classic white sweet corn known for exceptional flavor and large ears.

• Honey Select: Popular triple sweet bicolor with excellent sweetness and tenderness.

• Ambrosia: Sweet bicolor variety with high sugar content and great fresh-eating quality.

• Peaches & Cream: Traditional bicolor sweet corn with dependable yields and classic flavor.

When to Plant

Outdoor Planting:
Plant seeds outdoors after the last frost once soil temperatures reach at least 60°F. Warmer soil (65–70°F) results in faster germination and stronger plants.

Light & Space Requirements

Sunlight:
Corn requires full sun for strong stalk development and proper ear formation.

In-Ground Spacing:
Row spacing: 30–36 inches
Plant spacing: 8–12 inches

Corn should be planted in blocks of multiple rows rather than a single long row to improve pollination.

Raised Beds:
Plant in blocks with 8–12 inches between plants in all directions to ensure good pollination.

Pro Tip:
Wind pollination is critical for corn. Larger blocks of plants produce fuller ears.

G90 Sweet Corn

Soil & Fertility

Corn is a heavy feeder and benefits from nutrient-rich soil.

Soil Requirements:
pH: 6.0–6.8
Loose, well-drained soil with high organic matter

Fertilizer Schedule:

Before Planting:
Mix 2 cups of HOSS Complete Organic Fertilizer per 10 ft of row

2 Weeks After Transplanting:
Using the Hoss Fertilizer Injector, Mix 1 cup of Hoss Premium 20-20-20 Fertilizer -AND -1-2 cups of Hoss Micro-Boost Micronutrient Supplement per 20 ft. of row.

4 Weeks After Transplanting:
Using the Hoss Fertilizer Injector, Mix 1 cup of Hoss Premium 20-20-20 Fertilizer-AND -1-2 cups of Hoss Micro-Boost Micronutrient Supplement per 20 ft. of row.

Alternate Every 14 Days:
Mix 2 cups of Hoss Premium Chilean Nitrate -AND -1-2 cups of Hoss Micro-Boost Micronutrient Supplement per 20 ft. of row.

Pro Tip: Discontinue fertilizing schedule once the tassel starts to develop.

Pest & Disease Control

Pest/Disease	Control Method
Corn Leaf Aphids	Garden Insect Spray, Horticulture Oil, Bug Buster-O, Take Down, Take Out
Corn Earworm	Garden Insect Spray, Bug Buster-O, Take Out
Stinkbugs	Garden Insect Spray, Horticulture Oil, Take Down, Take Out
Flea Beetle	Horticulture Oil, Bug Buster-O, Take Down, Take Out
Corn Borer	Take Down, Take Out
Cutworms	Diatomaceous Earth, Take Out
Common Rust	Complete Disease Control, Fungi Max
Grey Leaf Spot	Complete Disease Control, Fungi Max
Blight	Complete Disease Control, Fungi Max

Irrigation & Watering Schedule

Corn requires consistent moisture throughout the growing season, especially during tasseling and ear development.

Provide 1–2 inches of water per week, increasing during hot weather. Inconsistent watering during pollination can result in poorly filled ears.

Drip irrigation or soaker hoses are recommended to maintain even soil moisture.

Mulching helps retain moisture and suppress weeds.

Peaches and Cream Sweet Corn

Harvesting & Storage

Harvest:
Corn is ready to harvest about 18–24 days after silks first appear. Ears are mature when the silks turn brown and dry and kernels release a milky juice when punctured.

Twist ears downward and pull to remove them from the stalk.

Storage:
Sweet corn is best eaten immediately after harvest as sugars quickly convert to starch.

Refrigerate unshucked ears for up to 3–5 days.

Preservation Tip:
Corn freezes well. Blanch ears or kernels before freezing for long-term storage.

Sustainability & Garden Tips

• Plant corn in blocks rather than long rows for better pollination
• Rotate crops yearly to prevent pest buildup
• Mulch to conserve moisture and suppress weeds
• Compost healthy stalks after harvest

FAQs

How long does corn take to grow?

Most sweet corn varieties mature in 60–90 days, depending on the variety.

Why are my corn stalks falling over?

Strong winds, shallow roots, or nutrient imbalance can cause lodging. Hill soil around plants for support.

Why are my corn ears not fully filled out?

Poor pollination is usually the cause. Plant corn in blocks to improve pollen distribution.

How many ears does one corn plant produce?

Most plants produce 1–2 ears per stalk.

What happens if I harvest corn too late?

Kernels become starchy and lose sweetness.

Published on March 13, 2026
Updated on March 16, 2026

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