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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.
It then has another growing season in spring before summer heat forces it into dormancy. The optimum time for planting depends on when winter weather normally arrives in your area. Fescue grass will take as little as seven days to germinate, but it can take as many as 21 days for maximum germination.