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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.
Vegetables that Mature in 30 Days. Radishes, mushrooms and spring onions are ready to harvest in 25 to 30 days. Baby greens, such as loose leaf lettuce, mesclun mix, spinach and Swiss chard can be harvested in 35 days. Radishes wilt and become spongy quickly, pay close attention to them to pick them at their peak.