Prepare the soil along a fence or trellis. Mix in about 4 inches of an organic mulch. Mix in an all-purpose fertilizer (like 10-10-10). Use about 4 to 6 cups of fertilizer per 100 square feet.
Push a pumpkin seed into the soil with your finger next to a trellis or a fence. Push it in to a depth of about 1 inch. Repeat this three to four times, leaving about an inch of space between the seeds. Cover the holes with soil. These seeds form your first “hill” of pumpkins.
Walk about 5 to 6 feet away from the first hill of pumpkins, along the trellis or fence. Plant four to five more pumpkin seeds in a second hill. Repeat this procedure until you run out of space along the trellis or fence.
Keep the pumpkin seeds consistently moist until they sprout. Give the pumpkin plants about 1 to 2 inches of water per week as they grow.
Train the vines to grow vertically up the trellis as the plants grow. Tie the vines loosely to the trellis with twine or plant ties. As the vines continue to grow, remove the old twine and replace it so that the vines can continue to grow upward.
Monitor the pumpkins as they develop. When they grow to about the size of a grapefruit, cut pairs of old pantyhose with scissors so that the legs are separate. Place each pumpkin into its own pantyhose leg. Tie the pantyhose to the trellis to support the pumpkin's weight.