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.
2. Cut off the outer leaves of the plants with a small pair of garden shears to harvest just a few leaves. Remove the leaves at the base, leaving the inner leaves to grow on and continue producing. Trim back the entire plant when it reaches 3 to 6 inches high, or approximately every 10 days.
How To Grow Lettuce. Growing your own lettuce is easy! Try these tips for how to grow lettuce indoors or outdoors.