So you've been growing your lettuce, now what? Ideal harvest time for your lettuce mix, comprised to romaine lettuces, rossa leaf lettuce, oak leaf lettuce, and red and green leaf lettuce. Ideal harvest time when growing indoors is between 28-40 days. If you wait too long to harvest your lettuce mix it can become bitter tasting.
The best tip I can give is to harvest when you need it. Use it as fresh as possible. Add it to your salad mix (throw in some microgreens, arugula, spinach, chard!), use it on your burgers or fish tacos, add it to your eggs in the morning as a side salad, and throw in some vine ripened hydroponic cherry tomatoes too.
You can get 2-3 good tasting harvests from your lettuce mix before you'll want to replace it with new seeds.