ive done this! lol but my onions didn't grow for very long.. can't do it indefinitely. then I tried to plant them in some dirt and get them to go that way but i failed lol - love green onions!
u can grow so many from the scraps! celery, pineapple, onions, potatoes, love it!
Yeah like when they get to the length in the picture with the window, that's when I start to use them. I think a lot depends on the amount of light as well.