If you have room, plant again when the first corn plants have 3-5 leaves. This usually takes 2-3 weeks. You will need 1-2 ounces of seed for every 100 feet of row. Do not use seed saved from last year's sweet corn. The seeds will not grow a good crop.
Sweet corn grows best when planted in several short rows instead of one long row.
This makes it easier for the corn plants to pollinate. Good pollination will help your ears of corn have plump, juicy kernels. Plant the corn seeds about 1 inch deep and 3-4 inches apart in the row. After the plants are up, thin them to one foot apart. If you plant them closer, your corn will have small, poorly-filled ears.