Lettuce can be harvested at pretty much any stage. You can pick off outer leaves and let the center still grow, but... frankly the center is the best part. You can harvest heads at baby stage, or full size. Many lettuces only hold for about 2 weeks once they reach full size. After that they want to flower (this depends on weather and variety). If you see it start to bolt (start growing UPWARDS, to start growing a flower) harvest immediately, as the taste really declines and becomes bitter. I'm sure others have better info than I do on this matter as well.
Last edited by wormgirl; May 24, 2015 at 11:29 PM.
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