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Growing Sweet Corn: From Planting to Harvest

Nothing beats the taste of sweet corn picked minutes before cooking—sugars haven’t converted to starch. With proper timing, spacing, and care, homegrown corn is a summer highlight.

Soil Preparation

Deep, fertile, well-drained loam; pH 6.0–6.8.
Incorporate 2–3 inches compost/aged manure in fall or early spring.
Rotate crops; avoid following corn with corn. Precede with legumes (peas/beans) for nitrogen.

Variety Types & Timing

Standard (su): Traditional flavor, plant at 55°F soil.
Sugar-enhanced (se): Tender, sweeter, longer shelf life; plant at 60°F.
Supersweet (sh2): Very high sugar, crisp; need 65°F soil, isolation from other types.
Synergistic (sy): Combines traits; 60°F.

Plant after last frost when soil reaches minimum temperature. Succession plant every 2 weeks for extended harvest.

Planting for Pollination

Corn is wind-pollinated. Plant in blocks of at least 4 rows (preferably 10+ plants each), not long single rows. Space seeds 8–12 inches apart, rows 30–36 inches apart. Depth: 1 inch (cool soil) to 2 inches (warm).

Care & Maintenance

Water: Consistent moisture critical at tasseling, silking, ear fill. 1–1.5 inches/week. Drip irrigation ideal.
Fertilize: Side-dress with nitrogen when 12 inches tall, again at tasseling. Organic: blood meal, fish emulsion.
Weed: Shallow cultivation; mulch to suppress.
Support: Hill soil around bases at 12 inches for stability.

Pollination Boost

When tassels shed pollen, gently shake stalks in early morning (no wind) to distribute pollen onto silks. Each silk connects to one kernel.

Harvest Window

Check 18–24 days after silk emergence. Kernels should be plump, milky when punctured (not watery or doughy). Harvest at dawn for peak sugar. Refrigerate immediately; use within 1–2 days.