I wish I had better window sills for a trick like this – and more patience. This only takes a few days, and those who have done it will tell you it happens fast, but no doubt I would be standing over them. pressuring my scallions until they felt like stomping out the front door yelling “I don’t know where, JUST OUT!” Still, don’t let that deter you.
It’s a simple has placing them in the water – not too high – and keeping it fresh. It should all be over in a week. Enjoy, and get further details here.