Sinking your teeth into a perfectly ripened ear of sweet corn is one of the finest pleasures of summer, and early-maturing sweet corn varieties like Sugar Buns will offer a harvest sooner than you might think. You will need to wait 3 weeks longer for Silver Queen, but your reward will be kernels packed with sweetness and rich corn flavor.
Corn needs plenty of space for two reasons — it is a heavy feeder, and it is primarily pollinated by wind. As grains of pollen are shed by the tassels that grow from the plants’ tops, they must find their way to the delicate strands of silk that emerge from newly formed ears. To make sure silks are nicely showered with pollen, grow corn in blocks of short rows rather than in a long, single row. In a small garden, 15 plants set 1 foot apart can be grown in a 3 x 5-foot bed. Growing corn on this tiny scale is a good way to introduce yourself to the crop if you’ve never grown it. After the first year you will probably want to increase the size of the planting to at least 4 rows 10 feet long.
Corn plants are not like tomatoes or most other vegetables, which bear over a long period of time. Instead, they form a few ears per stalk and they are finished. Because of this, gardeners who have the space often make 2 or 3 plantings 2 weeks apart to keep the harvest coming.
Soil, Planting, and Care
Corn needs a spot with that gets full sun and has fertile, well-drained soil with a pH of 6.0 to 6.8. Seedlings can be set out as soon as the last spring frost has passed. Space plants 8 to 12 inches apart. In case of a surprise late frost, be prepared to cover seedlings with a fabric row cover. In cold climates you can plant in a raised bed covered with black or IRT plastic (infrared transmitting plastic) that will warm the soil. If possible, lay the plastic a week or so before planting.
Plan to fertilize twice because corn is a hungry plant. Before setting out seedlings, amend the soil with compost and mix a balanced organic or timed-release fertilizer into the soil. About a cup of 10-10-10 per 10 feet of row is a good general rate, but be sure to check and follow rates given on the label of any fertilizer you are using. About 6 weeks or so later, when the plants start to produce tassels, fertilize them again. (If you amend the soil with cottonseed meal or other high-nitrogen amendment, it may not be necessary to feed the second time.) Use a hoe or trowel to mix the fertilizer into the top inch of soil between the plants. After this booster feeding, water your corn once or twice weekly if the weather is hot and dry.
Normal plants should grow fast with dark green healthy leaves. Corn will tell you if it is hungry by turning very light green. If so, feed again.
Corn grows fast and needs lots of water to grow properly. It also has shallow roots that make it susceptible to drought. Soaker hoses will insure that your corn gets the water it needs. However, for a large planting, soaker hoses may not be practical.
Hopi and Navaho Techniques
Native Americans in arid climates planted corn in basins to catch spring rainwater and help keep the corn roots down where water would be available longer. The basin was about 4 inches deep and 2 to 3 feet wide with a raised ridge made from the excavated soil around it. Plants were arranged so that they formed a spiral from the center to help with support in wind and with pollination. If you live in an arid climate or a hot climate and have poor sandy soil, as in the Coastal Plains, this technique could help ensure a good harvest.
Corn plants that are blown over by gusty storms usually right themselves after a few days of sunny weather. As you shuck and clean your corn, pop off ear tips damaged by corn earworms. The different types of corn should not be allowed to cross-pollinate, so plant them in such a way that pollen from one type does not reach another type. If you or a nearby neighbor grow multiple types, be sure that they are isolated by at least 250 feet or that their timing is such that they are not in bloom at the same time. If not, the pollen from types that are not the same can muddy their characteristics to the point of ruining sweetness and flavor.
Raccoons love corn. The most effective way to keep them out of the patch is to surround it with a fence with 2 strands of electric wire 4 and 12 inches from the ground. Some gardeners have been successful with throwing blackbird netting over and around the plants because some raccoons don’t like it. The methods for keeping raccoons out of corn are as varied as gardeners themselves. We’ve heard of people putting flashing lights in the corn patch, putting a radio on a timer to blare loud music, laying newspaper in rows because the raccoons don’t like to walk on the crinkly paper, spraying animal repellents, and other techniques, but a physical barrier such as an electrified fence seems to be the most reliable.
Harvest and Storage
Most corn plants will yield at least 2 ears per stalk. Hybrids may yield more. To see if an ear is ready for harvest, look at the silks. They should be brown and dry with just a little fresh green at the base. Squeeze the husk to see if the ear inside feels plump, not skinny. If you’re still not sure if the ear seems ripe, check by peeling just enough of the husk back to expose a couple of inches of the ear. Poke a kernel with your fingernail. The corn is ready to pick if it bleeds a light milky sap like skim milk. If the liquid is clear, the ear is not ready. Ears that are too ripe will look too milky, like cream versus skim milk; they often taste starchy. Remove them right away.
Perfectly ripened ears also taste sugary-sweet when sampled raw. When possible, harvest sweet corn in the morning, when the ears are cool. To remove the ear, use one hand to hold the corn stalk and the other to pull the ear down and away from the stalk, twisting a little until it breaks off.
Place harvested ears in the refrigerator right away. When kept chilled, they should hold much of their sweet flavor for up to a week, though they’ll taste best if eaten as close to harvesting as possible. Corn can be blanched and frozen, on or off the cob.
What are the reddish spots showing up on my corn leaves?
When is the best time of day to harvest corn?
How do I know if ears are ripe?
I was weeding around the corn with a hoe yesterday. Today stalks are wilted, even though the soil is moist. What is happening?
The corn in my garden is attracting birds and raccoons. What can I do to protect the harvest?
Shoots are coming out of my corn stalks near the ground. Will they produce corn?
My garden space is small. Can I grow corn without planting it in long rows?