When I buy green leaf, romaine, or similar types of lettuce, I generally just cut what I need from it and keep it in the refrigerator crisper drawer, and then I take the bottom portion and put it in a rocks glass in my windowsill with about an inch of water. It grows new leaves! With scalliions I cut off the bottom section about 1 inch from the roots and put those in shot glasses or plant them in my garden.
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You can do this with a lot of salad vegetables, apparently. And you can grow ramps from garlic cloves, too. I learned about this from an article I found online and was delighted to be able to get more use out of my salad veggies, especially since the weather here in NE Ohio is so unpredictable in spring. We had a bit of snow and the temperature was down to around 30F one night last week. Today it was 74F, LOL!