This is a great idea, I use SO many green onions. Next time you buy them, save the white ends with the roots and put them in a clean glass of water. Place them in a sunny spot and they grow! Cut what you need and you'll have green onions indefinitely.
How to Regrow Food in Water: 10 Foods that Regrow Without Dirt
Save money by regrowing these 10 foods that regrow in water without dirt. Perfect if you don't have room for a garden & trying to save a few bucks! Regrow lettuce, regrow celery... regrow vegetables with one of the best budget tips of the year, and easy for anyone to do! :: DontWastetheCrumbs.com