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The leaves become bitter and the plants begin to bolt as the stem elongates into a tall bloom stalk. Leaf lettuce varieties take about 40 days from seeding to harvest while head types may take 70 days. This is another reason the head types are more of a challenge. To get more from your garden space, consider interplanting your lettuce with slower maturing crops.
Typical storage time 1 to 4 weeks. Lettuce is best harvested in warm weather, but this is also when demand for salad peaks, resulting in shortages at the start of a fine spell. Weather forecasts are used to predict surges in demand - but if these are wrong, the lettuces may be refrigerated for several days.