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.
3. Trim back the entire plant when it reaches 3 to 6 inches high, or approximately every 10 days. Cut back to within 1 to 2 inches of the ground. Most loose-leaf lettuce varieties grow back from a severe trim to produce more leaves.
1 You could lose about a fourth or third of your lettuce. 2  Fold each half of lettuce in half and cover tightly with aluminum foil. 3  Lettuce will last fresh for days and will not be limp. 4  Celery works as well with the aluminum foil.