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Sweet corn
Zea mays
Overview
The classic summer vegetable whose sugars begin converting to starch the moment it's picked — the truest 'farm to table' argument there is. Sweet corn was developed from wild teosinte in Mexico over 9,000 years ago in one of agriculture's most dramatic domestication events. Modern supersweet varieties hold their sweetness longer, but nothing beats the flavor of corn eaten within minutes of harvest.
Mentioned in The Mycelial Grimoire
Posts on the Grimoire that reference Sweet corn.
Growing Conditions
How to Grow Sweet corn
Sweet corn (Zea mays) is an annual forb/herb that grows to about 8 feet tall and 1.5 feet wide.
To grow sweet corn, give it full sun. It is hardy across USDA hardiness zones 10b–11. Plant it in rich, well-drained, fertile soil with plenty of nitrogen, at a slightly acidic pH of 5.8–7. It does best with consistently moist to wet soil.
Exact sowing, transplanting, and harvest months shift by climate zone — the planting calendar below lays them out for cool through hot regions. Its yellow flowers appear from June through July. Give it a season to establish, and it carries itself through the dry stretches.
Companion Planting & Soil
Sweet corn grows well alongside bean, squash, cucumber, pea, and sunflower — but keep it clear of tomato and celery.
Good Companions
Avoid Planting Near
Planting Calendar
When to sow, transplant, and harvest by growing zone.
| Zone | Action | Months | Notes |
|---|---|---|---|
| Cold (1-2) | Direct Sow | Jun — Jun | Direct sow when soil is 60°F+; plant in blocks of 4+ rows for pollination |
| Cold (1-2) | Harvest | Aug — Sep | Harvest when silks are brown and dry; kernels release milky juice |
| Cool (3-4) | Direct Sow | May — Jun | Direct sow when soil reaches 60°F; blocks not rows for wind pollination |
| Cool (3-4) | Harvest | Jul — Sep | Harvest 18-24 days after silks appear; eat immediately for best sweetness |
| Moderate (5-7) | Direct Sow | Apr — Jun | Direct sow after soil is 60°F; succession sow every 2 weeks |
| Moderate (5-7) | Harvest | Jul — Sep | Harvest when silks brown; press kernel — should be milky |
| Warm (8-9) | Direct Sow | Mar — Apr | Direct sow in spring; can succession sow through May |
| Warm (8-9) | Harvest | May — Jul | Harvest in morning for best sweetness; refrigerate immediately |
| Hot (10+) | Direct Sow | Feb — Mar | Sow in early spring; soil warms quickly |
| Hot (10+) | Harvest | Apr — Jun | Harvest before extreme heat dries silks |
Uses
In the Kitchen
In the kitchen, sweet corn turns up in more than one form: fresh off the cob — boiled, grilled, or roasted; cut from cob for succotash, chowder, and salads; dried and ground into cornmeal and masa.
Medicinal & Folk Use
In herbal and folk tradition, it has been valued in several ways: corn silk tea traditionally used as a diuretic for urinary health; good source of B vitamins, particularly thiamin; lutein and zeaxanthin support eye health. These are traditional uses, not medical advice.
Beyond the Garden
Sweet corn earns its keep past the plate, too: three Sisters planting with beans and squash; stalks provide structure for pole beans to climb.
