Better yet, consider starting a hydroponic system. While hydroponics may seem intimidating at first, home systems can be surprisingly simple and require very little space. The Kansas State University Home Hydroponics handout provides easy-to-follow information for gardeners interested in getting started:
https://hnr.k-state.edu/extension/consumer-horticulture/garden-hour/webinar-resources/garden_hour_resource_handouts/Home%20Hydroponics%20Handout%2012.04.2024.pdf
Lettuce isn't the only crop that can be planted in August. Three main groups of vegetables perform well in fall gardens: leafy greens, root vegetables, and brassicas such as broccoli, cauliflower, and cabbage. In many cases, cooler fall temperatures improve both the flavor and quality of these crops.
For more information about planning and planting a fall vegetable garden, check out this Kansas State University publication:
https://www.sedgwick.k-state.edu/gardening-lawn-care/documents/Fall%20Vegetable%20Gardening1.pdf
Thinking about growing your own lettuce? You're not alone. Recent outbreaks of foodborne illnesses and recalls of commercially produced lettuce have many people paying closer attention to where their food comes from. Luckily, August is a great time to sow lettuce seeds for a fall harvest.
While it may take a few weeks before you harvest fresh leaves, growing your own lettuce gives you complete control over the process. You'll know exactly where your food came from, what was applied during the growing season, and how it was handled before it reached your table.
Growing your own food doesn't have to stop when summer ends. Lettuce and many herbs can be grown indoors throughout the winter, providing fresh produce year-round. All you need are a few containers, potting soil, seeds, and a sunny location.