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.
Lettuce grows best in rich well-drained soil high in organic matter. You can improve the soil by adding compost or manure. If you have poor soil consider using a raised bed adding topsoil, compost and manure, which is what I've done here. Start with a sterile seed mix, or one you've made yourself.est Conditions for Growing Lettuce. Given the right conditions lettuce can be very easy to grow. Lettuce can be started from seed either indoors or directly into the garden. You can also purchase transplants at a nursery.