Crispy frills, garlic chives and red leaf are a few varieties that can be grown in the same pot. Others are spinach, butter lettuce, red oak, green oak and romaine. The time range for lettuce to come up is about 40 days.
Spinach is a good leaf to cultivate for beginners.
Be sure to keep soil moist and expose the plants to lots of sun. Peppers work well with the same soil and are great to toss into a salad for a little kick. Keep the soil moist, and in less than three months, you'll have a nice salad. Be sure to keep a two-pot method going with lettuce so that you never run out. In other words, once one pot has finished its harvest, the other pot should be ready for harvesting.