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.
How to Clean Lettuce: Using a Salad Spinner. If you have a salad spinner, this is its shining moment; add the lettuce to the inner basket that sits inside the bowl and fill it with water. Gently massage the lettuce to encourage the dirt to separate. Pull the basket out of the water and dump the water.