The highest yields were achieved with planting dates between April 5 and May 5. A planting date that was too early (between March 20 and April 5) or too late (between May 5 and May 20) yielded significantly less.
|Planting Date (+ / – 3 days)||Yield (Bu/Acre)*|
|Planting Date (+ / – 3 days)May 1||Yield (Bu/Acre)*183 b|
Sow outdoors in late spring, in the ground or in pots. Make sure the soil temperature is above 10°C (50°F). As sweetcorn is wind pollinated, plants should be grown in blocks rather than rows, 45cm (18in) apart. Sow two or three seeds at each point, then thin out the extra seedlings to leave just the strongest one.
When to Plant Corn It’s important to get corn planted as soon as possible, since it requires a fairly long growing period with warm weather. If you live in an area with a shorter growing season, choose an early variety that will mature well before the first fall frost.
When calculating how late you can plant corn, take those 60 to 100 frost-free days into consideration. If there are fewer than 60 days left in the season before the first frost is expected, there may not be enough time for your corn to mature.
Soak Corn Seeds Sweet corn seeds can appear shrunken and shriveled; before they can germinate, they must slowly plump up with water. To help them along, soak dry seeds in water at room temperature overnight before planting.
Check planting depth when starting each field. In summary, corn should never be planted less than 1.5 inches deep, 1.75 to 2.25 inches is an ideal target, but depending on soil type and conditions, may be planted up to 3 inches deep without any effect on stand establishment.
Use 2 to 3 pounds of fertilizer, such as 10-10-10, for every 100 square feet of garden area. Spread the fertilizer evenly over the soil and work it into the soil 3 to 4 inches deep. Rake the soil to smooth the surface.
Using the three sisters method that we’ve already mentioned, you can plant corn for trellises, and after the corn has grown to just a few inches, you can proceed with adding the beans and squash. Here, the bean seeds feed the corn with nitrogen and provide shade for the roots.
To keep your garden soil healthy and disease-free in 2015, I suggest cleaning up all the cornstalks as soon as the harvest is over. You can roto-till the cornstalks into the soil as additional organic matter, or, if you prefer, shred them. Roto-tilling the stalks will normally take two passes a few weeks apart.
Risks of Early Planted Corn. It is not uncommon for emergence to take from two to three weeks after planting to occur, rather than a more desirable five to seven days. Uneven soil temperatures within the seed zone may result in uneven germination and emergence, causing potential yield losses of eight to ten percent.
Corn plants need approximately 1 1/2 inches of water every week in order to thrive and reach their full potential. Drought conditions will result in stunted plants that are reluctant to produce full sized ears of corn. Because diseases are fairly rare, it’s fine to water the tops of the plants as well as the roots.
Is sweet corn easy to grow? Sweet corn is easier to grow than many people think. It can be grown in large containers, or the ground, and only requires a bit of room to anchor its tall stems. Plant it in ‘blocks’ rather than rows as it is pollinated by the wind.
A rule of thumb for planting corn is to space the rows approximately 36 inches apart and space the plants within each row approximately 12 inches apart. A configuration of no more than three or four sets of these double rows provides good pollination for the developing ears of corn.
Plant corn as early as practical for best results, typical- ly before May 1 in West and Middle Tennessee and before June 1 in East Tennessee. The average yield decreases by approximately one bushel per day when planted after May 1 to June 1, and yield loss is even greater when planted after June 1.
When to plant Sweet corn grows best in full sun and in rich, warm soil. It doesn’t do as well in frost or freeze conditions, but likely will survive light or scattered frosts. Start planting on or just prior to the mean frost-free date for your region. Planting can continue as late as early July.