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.
âThe leaves make perfect boats for lettuce wraps, which benefit from the crispiness that iceberg lettuce is known for.â. To clean iceberg lettuce, give the head a good rinse under cool running water and pat dry. Place on a cutting board and remove outer leaves that may be dirty or wilted, usually just the outer four.