How To Grow A Sprouted Onion Indoors. #1 having the sprouted onions ready. Always use fresh seeds, since onion seeds are short lived and are less likely to successfully germinate over time.
Both attack growing onions and onions in storage. Both cause stunted growth and promote rot.
5 Veggies You Can Regrow From Kitchen Scraps Veggies
Carefully place each onion in a pot, covering them with soil so that the base of the shoots meet the surface of the soil. Cut into the onion, nearly to the center, trying to avoid the sprouting center portion: