Lettuce Seeds are Seeds that can grow on plowed soil into Crisphead Lettuce heads. Lettuce can also be processed for 2 Lettuce Seeds. Like all crops a lettuce seed will need Water, Bog Water or Mineral Water 1 block close to it to grow; it can be fertilized with Pigsy Droppings to grow faster, but it will stay fallow in too cold (snowy, icy), too high (above ca. 150) or too hot (lava layer) environments as well as in Swamplands.