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Best Answer: a normal head of lettuce can weigh between 10oz, and 1 1/2 lbs. I should know I am addicted to lettuce. I eat it every single day. If you put three largish leaves, in your sandwhich the calorie content is small. A 1lb head of lettuce will have around 60 calories. So each leaf is around 5 calories. That is a normal sliced loaf size of bread. If it's a foot long, say at Subway, type thing, you have more lettuce- about five or sixe leaves, but they will be smaller leaves, so at most 30 calories.
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.