[header] How to grow iceberg lettuce [title] Plant the iceberg lettuce six to eight weeks before the last expected spring frost. [step] Fill the bottom of each cell of the tray with some standard potting soil before you sprinkle a few seeds into each cell. Cover the seeds with with a light layer of potting soil. 
[title] Plant iceberg lettuce seeds in a shallow seed tray. [step] Check the seed tray every day, and water the seeds whenever the soil feels dry.