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How to Grow Blue River II Corn

Blue River II Corn

Zea mays

vegetable

Blue River II is a hybrid sweet corn variety known for its exceptional sweetness, tender texture, and excellent field holding ability. This mid-season variety produces full-sized ears with a high sugar content that remains stable for extended periods after maturity, making it ideal for fresh market and home gardeners.

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Example Blue River II Corn timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Blue River II Corn

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Blue River II Corn

    Around Jun 29

    ≈ 73 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Blue River II Corn dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun, minimum 6-8 hours daily; 8+ hours optimal for maximum sweetness
💧
Water: Consistent moisture throughout growing season; 1-1.5 inches per week from rain or irrigation. Keep soil consistently moist but not waterlogged, especially during pollination and kernel fill stages.
📏
Spacing: 8 inches
📅
Days to maturity: 73-80 days
🌱
Planting depth: 1.5 inches

Soil

Type: Well-draining loamy soil rich in organic matter
pH: 6.0-7.0
Amendments:
Compost well-rotted manure balanced fertilizer (10-10-10 or higher nitrogen) peat moss if drainage needed

Growing Zones

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Thrives in zones 3-8; grows in zones 2-9 with proper timing

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a

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Growth Stages

1

Seedling (V1-V3)

7-10 days

Young corn plants with 1-3 visible leaves emerging from soil. Very vulnerable to pests and weather stress.

Protect from birds and cutworms with row covers if needed. Thin seedlings to proper spacing (8 inches apart). Monitor soil moisture—keep evenly moist but not waterlogged.

2

Vegetative Growth (V4-V10)

3-4 weeks

Rapid leaf expansion and stalk development. Plant reaches 12-36 inches tall. Root system deepens. Tassel emergence begins around V10.

Begin regular fertilization at V4-V6 stage with balanced or nitrogen-rich fertilizer. Side-dress with nitrogen at mid-growth. Control weeds by cultivation or mulching. Watch for early pest damage (corn borers, armyworms).

3

Flowering & Pollination (VT-R1)

1-2 weeks

Tassel emerges from plant top; silks emerge from ear husks. Pollen falls on silks for fertilization. Critical period for kernel development begins.

Ensure consistent, deep watering during this critical stage—stress causes poor kernel fill. Avoid insecticide sprays if possible to protect pollinating insects. Monitor for spider mites in dry conditions.

4

Kernel Fill & Maturation (R2-R6)

3-4 weeks

Kernels develop and fill with sugars and starch. Ears become full and plump. Silk turns brown. Husk tightens. By R5 (dough stage), kernels reach peak sweetness.

Maintain consistent watering without overwatering. Blue River II holds excellent eating quality even slightly past physiological maturity. Stop fertilizing. This variety holds its sweetness 2-3+ weeks past peak, allowing extended harvest window.

5

Harvest-Ready (R5-R6)

Ready at day 73-80; harvestable for 2-3+ weeks

Kernels are plump, filled with milky liquid (R5) to dough-like consistency (R6). Silks brown and dry. Ears feel firm in hand.

Harvest when silks are dry and brown, kernels pop juice when pierced, and husk is green. Harvest in early morning for best flavor and sweetness. Blue River II's exceptional holding ability allows selective harvesting over 2-3 weeks.

Companion Planting

Plan your garden →

Plant with:

Beans peas cucumber melon squash pumpkin radish lettuce marigold

Avoid planting near:

Brassicas (cabbage, broccoli) fennel tomato

Common Pests

  • Hand-pick infected ears; use Bt (Bacillus thuringiensis) spray at silking; plant resistant varieties; encourage natural parasitic wasps

  • Plant resistant hybrids; use Bt spray at whorl and tassel stages; remove and destroy infested plant debris; crop rotation

  • Handpick larvae; apply Bt spray; encourage predatory insects; use row covers for seedlings

  • Row covers for seedlings; diatomaceous earth on young plants; remove weeds that harbor beetles

  • Increase irrigation to maintain leaf moisture; spray water forcefully to dislodge mites; use miticides if severe; encourage predatory mites

  • and

    Install fence or netting; motion-activated lights and sprinklers; harvest at peak ripeness before wildlife fully targets patch

Uses

🍳

Fresh eating & boiling

Culinary

Blue River II is bred specifically for fresh market consumption with exceptional natural sweetness and tender kernels. Eat on the cob boiled, grilled, or roasted immediately after harvest for best flavor. [source]

🍳

Corn salads & raw preparations

Culinary

The high sugar retention and tender texture of Blue River II make it exceptional for eating raw in salads, salsas, and fresh preparations. The kernels remain sweet and tender even days after harvest compared to standard varieties. [source]

🍳

Freezing & preservation

Culinary

Excellent for home freezing due to superior kernel quality and sweetness retention. Blanch and freeze ears whole or cut kernels off cob for long-term storage that maintains flavor and texture. [source]

🏠

Garden succession planting

Household

The 73-80 day maturity and extended harvest window make Blue River II ideal for succession planting every 2-3 weeks to ensure continuous fresh corn harvest throughout the season. [source]

🦋

Wildlife food source

Wildlife

Corn provides essential carbohydrate nutrition for birds, mammals, and insects. The mature stalks and cobs also provide cover and nesting material for garden wildlife. [source]

Harvest Tips

Harvest when silks turn brown and dry, kernels are plump, and milky juice releases when punctured (typically days 73-80 after planting). Gently pull ear downward at 45-degree angle from stalk. Harvest in early morning for peak sweetness and tenderness. Blue River II maintains excellent eating quality for 2-3 weeks after physiological maturity, providing an extended harvest window unlike many corn varieties. Use immediately or refrigerate; flavor and texture decline after 2-3 days of storage, so eat fresh when possible.

Fun Facts

  • 🌱 Blue River II was developed through hybrid corn breeding programs emphasizing 'field holding ability'—the kernels maintain peak sweetness and quality for 2-3+ weeks after maturity, far longer than standard sweet corn varieties, making it invaluable for both home gardeners and fresh market growers.
  • 🌱 Sweet corn's sweetness comes from a genetic mutation that prevents sucrose from converting to starch; this is why fresh sweet corn tastes so different from field corn or popcorn varieties, and why Blue River II's genetics were selected to maximize and sustain this trait.
  • 🌱 Corn is a highly efficient converter of sunlight into biomass and is the most widely grown crop in North America; even home-grown Blue River II corn stores significantly more energy in its kernels per square foot of garden space than most other vegetables.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Full Sun Hybrid Mulch pH Pollination Row Cover
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