Lettuce is one of the easiest, most-rewarding vegetables to grow in the garden, containers and Grow Tubs. Choose from a variety of types, including iceberg, butterhead and leaf. Gurney's offers both seed packets and the easy-to-use seed tapes. Plant in the cool weather of spring and fall—and be sure to keep the soil moist. Most gardeners plant lettuce seed every few weeks so they have a continuous supply throughout the growing season.