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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, spinach and some varieties of potatoes also take about two to three months to grow to maturity. Potatoes. Potatoes are very easy vegetables to grow and you can grow them from the potatoes in your kitchen. There are many varieties, and each will be ready to harvest at different times.