How to Regrow Green Onions
Slice off the ends of the bulbs, leaving roots attached.
Stand the bulbs root-end down in a small jar with water until the roots grow.
Set on a windowsill and keep the roots moist. After a few days, green shoots will emerge from the tops of the bulbs. ...
Keep the roots submerged and change water at least once a week or you can plant in soil and continue to watch them grow over and over again.
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