If you are looking for a more involved method that can be used to grow your plants in soil without needing to start from scraps, then the following method is best: Lettuce is not the only vegetable ...

If they are grown too long indoors, they will become tall ... This would include beets, broccoli, Brussels sprouts, cabbage, carrots, cauliflower, Swiss chard, kale, lettuce, peas, radishes, spinach, ...