Cover the soil of the planting spot with a 3- to 4-inch layer of grass clippings. Turn the clippings into the soil at a depth of 8 to 10 inches.
Remove the sweet potato seedlings from their containers. Plant them at the same depth in the garden soil, using a hand spade. Space the seedlings 12 inches apart.
Water until the soil settles. Apply a 5-10-10 fertilizer two weeks after planting, according to the package directions, at a rate of 5 pounds per 10-foot row.
Cover the fertilized soil with a 1-inch layer of grass clippings. Add another inch of grass clippings four weeks later.