To define a number range, you have to create a new number interval: 1  Specify an alphanumeric key with up to 2 characters. 2  Specify the limits of the number interval.  Mark the number range if it is planned for external number assignment.
Inspect the lettuce plants for leaves that are ready to harvest. Most leaves are mature enough once they reach 1 to 3 inches long, but they should still be tender up to 6 inches long. Cut off the outer leaves of the plants with a small pair of garden shears to harvest just a few leaves.
Baby-sized lettuce reaches maturity in about 4-6 weeks. Sow lettuce seeds every couple weeks to stretch out the harvest season. How to sow lettuce seed: Drop a small amount of lettuce seeds into one hand, then pinch the seed between your forefinger and thumb of the other hand. Drop the seeds thinly over the soil. Lettuce seeds are tiny, and they need light to germinate, so cover the seeds lightly -- never more than 1/4-in (.5 cm) -- with potting medium. Then, spray with water until thoroughly moist. Mist every morning to keep the medium moist at all times.