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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.
Boil the lettuce for 10 to 15 minutes and then drain it. Chop it up a little, and then you can lay it on a tray to freeze it. For average home ponds, use an icecube tray- 1 cube every couple of days should be enough. For smaller tanks, just lay some flat on a tray and freeze it, and keep it in a baggie in the freezer.