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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.
Lettuce is one of our very oldest vegetables. It is native to the Mediterranean and Near East. It was grown in China in the fifth century. Lettuce was grown in royal gardens of Persian Kings (Iran) over 2000 years ago.eaf lettuce can be planted in the spring when the soil is dry enough to be worked. They can be planted two or more times every 10-14 days. Lettuce is a cool season vegetable. It cannot stand warm temperatures. Do your last planting of lettuce about 30 days before the hot days of early summer.