How to Grow Onions in Water: 13 Steps (with Pictures)

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Co-authors: 11

Updated: September 21, 2020

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To grow onions in water, start by selecting a jar that’s smaller than your onion so it doesn’t fall in. Then, fill the jar with water. Poke 4 toothpicks into the onion around its circumference so you can place it above the water without it falling down. Once the toothpicks are ready, set the onion on top of the jar with its roots pointing down so they’re submerged in the water. Place the jar on a window sill that gets plenty of sunlight and let your onion grow for 2 or 3 weeks. When you see a flower emerge from the top of the onion, transfer it to a pot of soil so it can continue growing. For tips on how to revive green onion scraps in water, keep reading!

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