Mais Zea mays

About Mais

Mais, the Filipino word for corn or maize, is scientifically classified as Zea mays, a member of the grass family Poaceae. It is the second most important cereal crop in the Philippines after rice, serving as a staple food in corn-eating regions of the Visayas and Mindanao, a primary ingredient in animal feeds nationwide, and the source of beloved Filipino street foods and desserts. The provinces of Isabela in the Cagayan Valley and Bukidnon in Northern Mindanao form the country's corn belt, together producing the majority of the national corn supply.

Corn is a tall, annual grass that grows 1.5 to 3 meters in height depending on the variety and conditions. The plant produces a single thick stalk with broad, strap-like leaves arranged alternately along its length. Male flowers (tassels) emerge at the top of the plant and release wind-borne pollen, while female flowers (silks) protrude from developing ears lower on the stalk. Each silk connects to a potential kernel — if pollinated, it develops into a plump grain; if not, it remains empty. This wind-pollination mechanism is why corn must be planted in blocks rather than single rows for proper ear development.

In the Philippines, three main types of corn are grown: yellow field corn for animal feed and industrial uses (comprising about 60 percent of total production), white glutinous corn (native white corn) for human consumption as binatog and a rice substitute, and sweet corn for fresh eating — boiled, grilled, or used in desserts like mais con yelo. Each serves a distinct role in the Philippine food system, from the feedlot to the family table to the street vendor's cart.

History and Discovery

Zea mays was formally described by Carl Linnaeus in 1753, though the plant had been cultivated for over 9,000 years before receiving its scientific name. The genus name Zea derives from the Greek word for grain or cereal, while mays comes from the Taino word mahiz from the Caribbean, which entered European languages through Spanish colonizers as "maiz."

Corn was domesticated from a wild grass called teosinte in the Balsas River valley of south-central Mexico approximately 9,000 years ago. Through thousands of years of selective breeding by Mesoamerican peoples — particularly the Maya and Aztec civilizations — the plant was transformed from a grass with tiny, hard-shelled kernels into the large-eared, starchy crop we know today. By the time Europeans arrived in the Americas in 1492, corn was the dominant food crop from southern Chile to southeastern Canada, supporting major civilizations including the Inca, Maya, and Aztec empires.

Corn arrived in the Philippines during the Spanish colonial period, likely in the late 16th century through the Manila-Acapulco galleon trade that connected Mexico to Manila. The crop adapted readily to the Philippine tropical climate and quickly became a staple food, particularly in the Visayas and Mindanao where rice production was less dominant. By the 19th century, corn was deeply integrated into Filipino foodways — boiled white corn replaced rice in many Visayan and Mindanaoan households, and corn-based dishes became part of the national culinary identity. Today the Philippines produces approximately 8 million metric tons of corn annually, making it one of the largest corn producers in Southeast Asia.

How to Plant Mais

Propagation method: Direct seeding (corn does not transplant well)

Germination time: 5 to 7 days

Best planting season in the Philippines: June to July (wet season); October to November (dry season with irrigation)

Step-by-Step Planting Guide

1. Choose your corn variety. Determine your purpose: sweet corn varieties like Sugar King, Honey Jean, or Golden Cross Bantam for fresh eating; native white glutinous varieties for binatog and traditional uses; or yellow field corn hybrids like Pioneer or Dekalb for animal feed. Purchase fresh, certified seed from reputable agricultural supply stores — corn seed viability drops significantly after one year.
2. Prepare the planting area. Select a site with full sun and good air movement — corn needs both for proper growth and pollination. Till the soil to a depth of 20 to 25 cm and incorporate compost or aged animal manure at a rate of 2 to 3 kilograms per square meter. Form shallow furrows 75 cm apart if planting more than one row. Corn is a heavy nitrogen feeder, so well-amended soil gives seedlings a critical head start.
3. Direct sow seeds in blocks. Plant seeds 3 to 5 cm deep, spaced 25 to 30 cm apart within rows, with 75 cm between rows. Always plant in blocks of at least 4 rows wide rather than single long rows. Corn is wind-pollinated — pollen falls from the tassels at the top of the plant and must land on the silks of neighboring plants. Block planting ensures pollen drifts in all directions, resulting in fully filled ears.
4. Water and thin seedlings. Water deeply immediately after planting. Keep the soil consistently moist (but not waterlogged) for the first two weeks. Seeds germinate in 5 to 7 days. If you planted 2 seeds per hole as insurance, thin to the single strongest seedling when plants reach 10 to 15 cm tall. Do not transplant the thinned seedling — corn has a fragile root system that does not survive transplanting.
5. Side-dress with nitrogen and hill up soil. When plants reach knee height (approximately 45 cm or 4 to 5 weeks old), apply the first nitrogen side-dressing — scatter urea (46-0-0) at 5 grams per plant in a band 10 cm from the stem, then use a hoe to hill up soil around the base of each stalk. This buries the fertilizer, supports the developing brace roots, and anchors the plant against wind damage during typhoons. Apply a second side-dressing when tassels begin to emerge.
6. Harvest at the right stage. Timing differs by type. For sweet corn, harvest 18 to 22 days after the silks first appear, when they have turned brown and dried. Test by peeling back the husk slightly and piercing a kernel with your thumbnail — if the juice is milky white, the ear is ready; watery means too early, pasty means too late. For native white corn (binatog use), wait until the husks are completely dry and kernels are hard and dented. Snap ears from the stalk with a firm downward twist.

Care Guide

Sunlight

Requirement: Full Sun

Mais requires full, unobstructed sunlight — a minimum of 8 hours of direct sun daily for optimal growth and ear production. Corn grown in shade or partial sun will be spindly, tall but weak, and produce small or poorly filled ears. In Philippine backyard gardens, avoid planting near tall trees, buildings, or fences that cast afternoon shade. The south-facing side of a property typically offers the most consistent sun exposure throughout the day.

Water

Frequency: Every 2 to 3 days, more during tasseling

Corn needs consistent moisture throughout its life cycle, but water demand peaks during two critical periods: the rapid vegetative growth phase (4 to 6 weeks after planting) and the tasseling-to-silking period when pollination occurs. Drought stress during pollination causes the most devastating yield loss — silks dry out before they can receive pollen, resulting in ears with missing kernels. During the Philippine dry season, water deeply every 2 to 3 days. During the rainy season, natural rainfall is usually sufficient but supplement during dry spells of more than 5 days.

Soil

Type: Loam, Sandy loam, Clay loam

pH Range: 5.8 to 7.0

Corn adapts to a wide range of soil types but performs best in deep, fertile, well-drained loam with high organic matter content. The alluvial soils of the Cagayan Valley and the volcanic soils of Bukidnon are naturally excellent for corn production. In backyard gardens, the key requirement is adequate fertility — corn is one of the heaviest nitrogen feeders among common vegetables, depleting soil nutrients rapidly. Avoid compacted clay soils where drainage is poor, or amend them heavily with organic matter and rice hull charcoal (biochar).

Humidity and Temperature

Humidity: 50 to 80%

Temperature: 25°C to 35°C (optimal); tolerates up to 38°C

The Philippine lowland climate is well-suited to corn production, with average temperatures falling squarely within the crop's optimal range. Corn is a warm-season crop that grows vigorously at the 28 to 32 degree Celsius daytime temperatures common across Luzon, Visayas, and Mindanao. Night temperatures above 24 degrees Celsius can slightly reduce kernel fill, which is why some of the highest-quality sweet corn in the Philippines comes from slightly elevated areas (300 to 800 meters) where nights are marginally cooler. High humidity during the wet season can promote fungal diseases but is otherwise not a limiting factor.

Fertilizer

Corn is among the heaviest feeders in the garden and requires substantial nitrogen to produce full, well-developed ears. At planting, apply complete fertilizer (14-14-14) at a rate of 10 to 15 grams per planting hole mixed into the soil. Provide the first nitrogen side-dressing (urea 46-0-0 or ammonium sulfate 21-0-0) at 30 days after planting when plants are knee-high, and a second application at 50 to 55 days when tassels begin to emerge. Organic growers can substitute with generous applications of chicken manure compost, fermented plant juice (FPJ), and fish amino acid (FAA) applied every two weeks.

Pruning

Corn does not require pruning in the traditional sense, but some management practices improve yields. Remove suckers (tillers) that emerge at the base of the plant if the variety is not a tillering type — these compete for nutrients without producing usable ears. After the ear is harvested, the stalk and leaves can be cut and composted, or left standing briefly to allow nutrients to translocate back to the soil. Some Filipino farmers practice "detasseling" (removing the tassel from select plants) in hybrid seed production, but this is not necessary for home gardens.

Growing Medium Options

Mais is almost exclusively grown in soil and is not practical for hydroponic or water culture systems. The plant's large size (2 to 3 meters tall), massive root system, heavy nutrient demands, and wind-pollination requirements make it unsuitable for most controlled-environment growing methods. While experimental hydroponic corn has been demonstrated in research settings, it requires enormous containers, industrial-scale nutrient delivery, and manual pollination — none of which are practical for home growers. For Philippine urban gardeners with limited space, corn is best grown directly in the ground in a dedicated plot, raised bed, or large grow bags (at least 40 cm diameter) arranged in a tight block for pollination.

Edible Uses and Nutrition

Edible parts: Kernels (fresh and dried), Young ears (baby corn), Silks (herbal tea)

Culinary Uses

Corn is deeply woven into Filipino food culture and appears in an extraordinary range of dishes spanning street food, main meals, desserts, and beverages. Inihaw na mais (grilled corn on the cob basted with margarine and sprinkled with salt) is a ubiquitous street food found at every beach resort, night market, and sidewalk vendor in the country. Binatog — boiled white corn kernels tossed with freshly grated coconut and a pinch of salt or sugar — is a beloved merienda snack sold by ambulant vendors calling "binatog!" through neighborhood streets. Mais con yelo (corn with ice and milk), also called corn in a cup, is a refreshing cold dessert combining sweet corn kernels with shaved ice and evaporated milk. Corn also features in savory dishes: ginataang mais (corn cooked in coconut milk), corn soup with chicken, and as a thickener in Filipino-style cream-based chowders. Dried corn is ground into cornmeal for bibingka (corn rice cake) and processed into cornick (deep-fried seasoned corn nuts), a popular Filipino beer snack.

Nutritional Highlights

Harvest time: Sweet corn: 70 to 80 days from planting; Native white corn: 90 to 100 days; Yellow field corn: 100 to 120 days.

Storage: Fresh sweet corn is best consumed within 24 to 48 hours of harvest, as sugars rapidly convert to starch after picking. Refrigerate unhusked ears immediately and use within 3 days. For longer storage, blanch kernels for 4 minutes, cool quickly in ice water, drain, and freeze in sealed bags for up to 8 months. Dried field corn and white corn store indefinitely in airtight containers in a cool, dry place — traditional Filipino households store dried corn in woven kaing baskets or sealed plastic drums.

Air Quality and Oxygen Production

Corn is a C4 photosynthesis plant, meaning it uses a more efficient carbon fixation pathway than most common garden plants (which use C3 photosynthesis). This makes corn exceptionally productive at converting carbon dioxide into biomass — a single corn plant can fix significantly more CO₂ per unit of leaf area than typical C3 vegetables and ornamentals. During its active growth phase of 70 to 100 days, a block of corn plants produces a substantial amount of oxygen while sequestering carbon into its large stalk, leaves, and root biomass.

CO₂ absorption: High (C4 photosynthesis pathway)

However, corn's air quality contribution is seasonal rather than year-round, as it is an annual crop that is harvested and removed after a single growing cycle. The carbon sequestered in corn biomass is only retained long-term if the stalks and leaves are composted and returned to the soil rather than burned — a common but environmentally harmful practice in some Philippine farming areas. For urban gardeners, composting corn stalks after harvest builds soil organic matter and retains the captured carbon in the garden ecosystem.

Toxicity and Safety

Humans: Non-toxic

Pets: Non-toxic (kernels); Cob is a choking hazard for dogs

All parts of the corn plant are non-toxic to humans. Corn kernels, whether fresh, cooked, or dried, are safe for consumption by people of all ages. Corn silk has a long tradition of use as an herbal tea in Filipino folk medicine, believed to support urinary and kidney health. The plant itself — stalks, leaves, and roots — is non-toxic and is widely used as livestock fodder throughout the Philippines. For household pets, plain cooked corn kernels are safe for dogs and cats in moderation. However, the corn cob itself poses a significant physical hazard: dogs that chew and swallow cob pieces can suffer intestinal obstruction requiring emergency veterinary surgery. Always remove kernels from the cob before offering corn to pets, and dispose of cobs where dogs cannot access them.

Common Pests and Diseases in the Philippines

Pests

• Fall armyworm (Spodoptera frugiperda) — the most devastating corn pest in the Philippines since its arrival in 2019. Caterpillars feed deep inside the whorl of young plants, destroying the growing point. Look for ragged holes in leaves and frass (sawdust-like excrement) in the whorl. Control with early detection, Bt spray, or neem-based products. Report severe infestations to your municipal agriculture office.
• Asian corn borer (Ostrinia furnacalis) — caterpillars that bore into the stem, causing breakage, and tunnel into developing ears. Signs include entry holes with frass on stalks. Remove and destroy infested plant parts. Trichogramma wasps are effective biological control agents used in Philippine corn IPM programs.
• Corn earworm (Helicoverpa armigera) — caterpillars that enter the ear at the silk tip and feed on developing kernels. Damage is usually limited to the top 2 to 3 cm of the ear. Applying mineral oil to silks after pollination can suffocate earworm larvae.
• Rats and birds — significant pests in Philippine corn fields, especially as ears approach maturity. Rats gnaw husks and eat kernels; birds peck at exposed ear tips. Physical barriers like netting or tin-can rat guards on stalks provide non-chemical control.

Diseases

• Downy mildew (Peronosclerospora philippinensis) — a serious fungal disease endemic to the Philippines causing stunted plants with pale, streaked leaves. Spread by wind-borne spores during cool, humid nights. Use resistant varieties, treat seeds with metalaxyl fungicide, and practice crop rotation.
• Southern corn leaf blight — tan, rectangular lesions on leaves that expand during warm, humid weather. Reduces photosynthetic area and can significantly lower yields. Plant resistant varieties and improve field sanitation by removing infected crop residues.
• Ear rot (Fusarium and Aspergillus) — fungal infections that produce moldy, discolored kernels. Some ear rot fungi produce aflatoxins which are toxic to humans and animals. Prevent by harvesting promptly at maturity and drying grain quickly to below 14% moisture content.