Answer: You can harvest Iceberg lettuce at any stage of development, but most gardeners wait until the heads reach 5-6 inches in diameter. Each plant will only produce one head of lettuce, so once you cut it, you'll have to plant new seeds to get a new head of lettuce. Why not plan to harvest one head every week or two so you'll have fresh lettuce over a long period of time? Next time you plant lettuce, plant only a few seeds , wait two weeks and plant more seeds, then wait two more weeks and plant more seeds? If you extend your planting times, the lettuce won't mature all at once.
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