Heat 1 cup of water up to about 85 degrees Fahrenheit, and place the moonflower seeds in the water overnight to aid with germination.
Select a site in your yard that has full sun and well-drained soil. Add 6 to 8 inches of compost to the soil, and work it into the soil to a depth of 10 inches.
Dig small holes about ½ inch deep and 2 feet apart from each other. Place the moonflower seeds in the holes, and cover the seeds with soil. Plant the moonflower seeds once the last chance of frost is past.
Water the seeds for 3 to 5 minutes.