Buy a bunch of green onions once, stick the white ends in a glass of water, and supposedly you’ll never have to buy green onions again. It’s one of those viral gardening hacks that sounds almost too perfect for anyone trying to trim a few dollars from the grocery bill. Unlike plenty of internet tricks, regrowing green onions really does work, and fresh green shoots can appear remarkably quickly from roots that otherwise would have gone into the trash. The questionable part is the word “forever,” because keeping a productive plant alive requires more than leaving an onion stump in the same glass of water indefinitely. We looked at what actually happens after repeated harvests and whether this kitchen-scrap experiment is useful enough to deserve permanent space on the windowsill.
