There are not a lot of garden plants that you can successfully grow indoors from seed to harvest in a month or so, but lettuce is an exception to that rule.

Lettuce prefers loose, well-drained soil that is rich in organic matter. Before planting, work compost or well-rotted manure ...

Salad greens need plenty of sunlight to grow—typically around six hours ... to harvest within 20-30 days after planting. Loose leaf lettuce can take longer, up to 40-50 days, unless you want ...