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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.
How long does a plant take to grow? Depends on entirely on the type of plant; annuals will go from seed  to flower in anything between 8 and 12 weeks.    Pernnial plants can literally take a lifetime bef â¦ ore they flower -  some up to 80 years from the time they germinate.   For me it took about 1 or 2 weeks to get a big sprout. Maybe to be fully grown is like 1 month and if your lucky, probably less than a month. Just make sure it ge â¦ ts sun & water. And you don't even need soil to grow u can use dirt.