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.
A benefit of growing your own lettuce is you can harvest it right before eating it. Rinse the leaves under running water. The easiest way to dry them is to place leaves in a salad spinner to remove the excess water. Or, you can dry them with a clean cloth or paper towel. If you wish to harvest lettuce earlier in the day for later use that day, store it in your salad spinner in the refrigerator. Or, refrigerate in a plastic bag.