Grains & Rice

Field Corn

Mature starchy corn harvested dry for milling into meal, masa, and feed.

Field corn, often dent or flint varieties, is grown to full maturity and harvested dry rather than eaten fresh like sweet corn. It is milled into cornmeal, grits, and masa, or used for feed and starch. Its hard, starchy kernels are too tough to eat off the cob.

Field corn is the starch-heavy workhorse of the corn world—bred not for sweetness but for maximum dry-matter yield and processing efficiency. Unlike sweet corn, which is harvested young and eaten fresh, field corn is left on the stalk until the kernels reach 15–20% moisture (versus sweet corn's 70%+), then harvested dry for milling into meal, flour, masa, starch, and oil. The identifying characteristic of mature dent corn varieties is the small dimple or "dent" at the kernel's crown, where the soft starch shrinks during drying. This high-starch content (60–75% of dry weight) makes it ideal for processing but means the raw kernels are too hard and nutritionally incomplete to eat directly.

The critical distinction for cooks: field corn requires processing to become palatable. Grinding alone produces cornmeal; nixtamalization—treating the corn with slaked lime (cal)—transforms it into masa, the foundational dough of tortillas, tamales, and pupusas. This ancient Mesoamerican technique, practiced for at least 3,000 years, does more than soften the kernels. The alkaline treatment liberates bound niacin (preventing pellagra), reduces mycotoxins, loosens the hull for finer grinding, and imparts masa's distinctive flavor and pliable texture. Without it, human digestion of corn is poor and nutrition incomplete.

In the kitchen, field corn manifests in two broad forms: ground products (cornmeal, masa, corn flour, corn starch) and whole-kernel products (hominy, pozole). Each behaves differently—coarse cornmeal absorbs liquid slowly for creamy polenta, fine masa flour hydrates rapidly for pliable tortillas, and corn starch gelatinizes at low temperatures for glossy gravies. Understanding which processing method produced your ingredient tells you how it will perform.

Measured in: g
Storage: Pantry

Types & varieties

Yellow dent corn

Dominant commercial variety in the US; high starch, neutral corn flavor; base for most cornmeal and animal feed

White dent corn

Preferred for tortilla and snack production; milder, slightly sweeter flavor than yellow; lower carotenoid content

Blue corn (Papago, Oaxacan)

Heirloom variety; earthy, slightly nutty flavor; higher protein than yellow dent; used in Southwestern cuisine and blue corn chips

Red corn

Heirloom variety; used in Mexican pozole and atole; slightly sweeter; contains anthocyanin pigments

Flint corn (Indian corn)

Hard starch throughout kernel; lower moisture than dent corn; resists spoilage; used for polenta and decorative purposes

Nixtamalization: The Process That Changed Corn

Nixtamalization is non-negotiable for traditional masa production. The process involves cooking whole corn kernels in a solution of water and slaked lime (calcium hydroxide), typically at a ratio of 1 liter water to 10–15 grams lime per kilogram of dry corn. The mixture is brought to a simmer and held for 25–45 minutes until the hulls loosen and the kernels swell. After resting and rinsing, the hulls rub away easily. The resulting nixtamal is ground wet into fresh masa. Commercial masa seca (dried masa flour) is simply nixtamal that has been dried and ground, then rehydrated with water before use. The lime does not add a detectable flavor when used properly—it simply transforms the corn's chemistry.

Slaked lime (calcium hydroxide) is the traditional alkali; food-grade pickling lime is the modern equivalent
Wood ash (containing potassium carbonate) was historically used and produces a different flavor profile
The nixtamal cooking liquid (nejayote) was traditionally reused as a base for soups and sauces in pre-Columbian cuisine
Over-cooking nixtamal produces a gummy masa; follow timing guidelines carefully

Why You Cannot Substitute Sweet Corn

This is the most common mistake cooks make with field corn products. Sweet corn and field corn are bred for opposite characteristics: sweet corn accumulates sugars that convert to starch slowly, while field corn prioritizes rapid starch deposition. When ground, sweet corn produces a mealy, bland powder that lacks the starch binding needed for tortillas, the absorbency for polenta, or the gelatinization properties for thickening. Recipes written for field corn products will fail with sweet corn. Conversely, field corn kernels are too hard and starchy to eat fresh—the texture is unpleasant and much of the nutrition is bound up in inaccessible forms.

Sweet cornmeal will produce gummy polenta and crumbly cornbread
Fresh sweet corn cannot be nixtamalized into edible masa—the sugar interferes with the process
When a recipe calls for cornmeal, masa, or corn starch, it means processed field corn, not fresh corn

Common uses

Masa for tortillas, tamales, pupusas, and arepas (requires nixtamalization)Cornmeal for cornbread, polenta, johnnycakes, and Italian polenta taragnaHominy (large-kernel hominy) for pozole, soups, and fried hush puppiesCorn flour (finely ground) for breading, batters, and baked goodsCorn starch for thickening sauces, gravies, and puddings; prized for clear, glossy resultHorchata (rinsed ground corn base) in Mexican rice-almond-corn drinkAnimal feed (the largest global use by volume)Baking adjunct (provides tender crumb, golden color, corn flavor in quick breads)Corn syrup and dextrose production (via wet milling)Popcorn is a type of flint corn with moisture sufficient for expansion

Tips & pitfalls

Buy nixtamalized masa flour (masa seca) for reliable home tortillas; rehydrate with water per package directions, or seek fresh masa from tortillerías for superior flavor and pliability
For polenta, use coarse-ground cornmeal labeled 'polenta' or 'medium grind'; fine-ground cornmeal absorbs liquid too quickly and becomes gummy
Toast dry corn kernels briefly in a dry skillet before grinding to enhance nutty flavor in homemade masa or meal
Whole field corn kernels require extended cooking— soak overnight, then simmer 1–2 hours— to soften; pressure cooking reduces time to ~30 minutes
Store cornmeal in the refrigerator or freezer if keeping beyond 1 month; the germ's high fat content causes rancidity at room temperature
Grinding cornmeal fresh (using a grain mill) yields superior flavor and aroma compared to commercial shelf-stable products
When thickening with corn starch, slurry it in cold water first—adding directly to hot liquid creates lumps
Common mistake: substituting sweet corn for field corn in recipes expecting cornmeal or masa; results will be mushy, bland, and texturally wrong

Nutrition

86kcal

Energy

360 kJ · per 100 g

Where the calories come from

Protein 13%Carbs 76%Fat 11%

Protein

3.2g

6% DV

Carbs

19g

7% DV

Fat

1.2g

2% DV

Fiber

2.7g

10% DV

Sugars

3.2g

of which

Sodium

15mg

1% DV

Notable micronutrients

Thiamin (B1)17% DV

Folate12% DV

Niacin (B3)11% DV

Magnesium9% DV

Vitamin C8% DV

Phosphorus7% DV

Source · USDA FoodData Central · approx. Corn, sweet, white, raw

View on FDC →

In the shops

Matched grocery products

Sweet Corn
Hacendado · 450 g · Mercadona
€1.55
Sweet Corn Bonpreu
BONPREU · kg · Bonpreu
€1.59
Sweet Corn Bonpreu
BONPREU · kg · Bonpreu
€2.49
Bonduelle Sweet Corn
BONDUELLE · kg · Bonpreu
€1.99
Pickled Corn Kernels
RIOVERDE · kg · Bonpreu
€2.99
Sweet Corn on the Cob
2 ud · Mercadona
€3.15

Good to know

Botanical name: Zea mays indentata (dent corn varieties)
Harvest state: Dry, mature kernels at 15–20% moisture (vs. 70%+ for sweet corn)
Primary use: Processed into meal, flour, masa, starch, oil, and animal feed; not eaten fresh on the cob
Starch content: 60–75% of kernel dry weight
Nixtamalization: Slaked lime (cal) treatment required for masa production; releases niacin and improves protein availability
Origin: Mesoamerica; domesticated from teosinte (Zea mays parviglumis) in Mexico ~9,000 years ago
Storage (whole kernel): Cool, dry, airtight container; 1–2 years with minimal quality loss
Storage (ground meal): Refrigerate; use within 6 months for best flavor

Substitutes

Instant masa mix — Acceptable substitute for nixtamalized cornmeal; not identical to fresh masa but functional for tortillas and tamales
Fine cornmeal (from sweet corn) — Not recommended; low starch, high sugar; will not perform similarly in most applications
Wheat flour — Only works as a textural substitute in batters; flavor and performance differ substantially
Hominy (canned) — Can substitute for pozole and hominy-based dishes where texture is the priority
Semolina or grits — Texturally similar for savory porridge preparations; flavor profile differs