Sweet corn, Also known as elote in many Spanish-speaking regions, it is one of the most emblematic and delicious crops you can have in your urban garden or orchard. Its characteristic flavor, its versatility in the kitchen y its ease of cultivation making it an excellent choice for both beginners and advanced enthusiasts.
Growing corn at home Not only is it a rewarding activity, but it also gives you the opportunity to consume fresh, pesticide-free food that is full of flavor, ideal for steaming, grilling, or simply simmering with salt and butter. Complete guide to planting and harvesting sweet cornWe'll tell you everything you need to know to achieve a bountiful and healthy harvest: from choosing seeds to harvesting.
Types and varieties of sweet corn
Before starting to grow, it is essential to know the main sweet corn varietiesThere are different types that differ in color, texture, sweetness, and ripening time.
- Open-pollinated corn: Also called standard or su, it is the most classic and is usually the favorite for its traditional flavor.
- Sugary Enhanced (SE): It produces sweeter beans than su, and retains sweetness longer after harvest.
- Supersweet (SH2): Much sweeter than the previous ones and with good post-harvest conservation.
- Synergistic: It mixes the genes of SE and SH2, producing cobs with grains of various types.
In addition, there are varieties in different colors: two-tone (yellow and white), intense yellow, pure white and even purple. Choose the one that best suits your climate and available space.
When to plant corn at home
Sweet corn needs temperate and stable temperatures to germinate, so sowing should be done when the frost has completely disappeared. In the Northern Hemisphere, this is usually between April and June, while in the Southern Hemisphere, it starts in September.
The soil temperature must exceed 15ºC to ensure good germination. If you plant early, the cold can stunt their development or even kill the newly emerged seedlings.
Preparing the soil or pot
Soil is one of the most important elements for successful sweet corn cultivation. This plant greatly appreciates fertile, well-aerated soils with good moisture retention capacity..
- Depth: In a pot, the container should be at least 40 to 50 cm deep and have a capacity of about 10 liters per plant.
- Composition: Mix compost, humus and some coarse sand to improve drainage.
- Ideal pH: Between 6.0 and 7.0. You can correct it with lime or sulfur if it's too far outside that range.
If you're planting in the garden soil, remove all weeds first, till the soil about 15 cm deep, and spread organic fertilizer such as worm castings or alfalfa meal four weeks before planting.
sowing the seeds
Sowing should be done directly in the ground or pot, since corn does not tolerate transplants well. Make sure you do it in a place with at least 6 hours of sun a day.
- Planting depth: 2 to 3 cm
- Distance between seeds: 20-30 cm
- Distance between rows: 60-90 cm
It is advisable to sow in blocks (at least 3 rows together) to improve the wind pollinationIf you use large pots, you can plant four seeds and leave only the strongest one once they sprout.
Care and Maintenance
Once the plants germinate, the ongoing care stage begins. This is when the crop requires the most attention.
Irrigation: Corn needs a frequent watering, especially during germination and ear formation. The soil should be moist, but never waterlogged. Ideally, water at the base to avoid wetting the leaves and flowers.
Fertilization: Apply a complete fertilizer every 20 days. You can use natural fertilizers such as compost, mature manure, or fish and blood meal.
Weeding: Keep the area free of weeds to prevent them from competing for nutrients.
Pollination
Because corn relies on the wind to move pollen from the male flowers (the tassels) to the female flowers (the silks), its blocky arrangement enhances this process. Still, you can help with hand pollination shaking the plants gently in the morning.
Beneficial associations
In traditional American agriculture the technique of “the three sisters”, which consists of planting corn along with squash and beans:
- The corn serves as a natural tutor.
- The beans they fix nitrogen in the soil.
- The pumpkin covers the ground and prevents weeds.
Other useful combinations are with cucumbers, peas, melon or tomatoes.
Prevention of pests and diseases
The most common pests are:
- Corn earworm: Tackle the ends. You can apply a few drops of vegetable oil to the ends when they start to dry out.
- Aphids: They feed on sap. Combat them with potassium soap or neem extract.
- Cutworm: It usually attacks young stems. Keep the area free of organic debris.
Regarding diseases, the corn smut (smut) is a fungus that deforms grains, although in Mexico it's consumed as a delicacy. If you don't want to preserve it, remove infected plants and dispose of them away from compost.
Sweet corn harvest
The most awaited moment arrives between 60 and 90 days after sowing, when the silks of the ear change color and the ear is firm to the touch.
You can check by piercing a pimple: if it oozes a milky liquid, it's ready. If it comes out clear, it's not ready yet; if it comes out dry, it's too late.
