DIY Green Onions: Re-use green onions/ science experiment with kids!)

I like to mix up some green onions, Gulden’s mustard, and mayo with the leftover turkey/chicken for yummy sandwich fixings after Thanksgiving.  So as I was chopping the green onions, I remembered a tip my friend Wendy taught me:  Make your green onions last a long time by chopping them and putting them in water (or into a pot of dirt).

I like to put them in the water as the kids can watch how fast the roots and the green onions grow!  Plus, it’s easy to pull out what you need again and chop, chop, chop!

So… chop off the green onion…

Then put the roots in water.  My friend used a shot glass for her small amount of green onions.  Since I had a bunch of green onions, I used a small jar.  Then watch because in just a few days…

Bam! Your kids are amazed.

Updated Tip: Make sure you change the water daily! And after the first time of watching it grow again and using it, I’d suggest planting it in dirt to let it fully regrow the third time. A great science lesson for kids!

27 thoughts on “DIY Green Onions: Re-use green onions/ science experiment with kids!)”

  1. Hi, Fun Mom,
    I love this post! It is a great tip for science for a homeschoolers or anyone (like me) who loves growing things!! I have a link-up on Wednesday, and I would like to invite you to join in. It is called ‘Encourage One Another’. I like your blog so much and think it would encourage others. I’m at Deeprootsathome.com starting at MN tonight (hopefully)! Thank you for considering this 🙂

  2. I’ve done that 3 years ago and even planted them on the ground. every year after the snows melt, it grows back. I don’t have to buy green onions.

  3. I saw this on Pinterest a while back and totally wondered if it works!! Glad to know it does…I make egg salad a lot and green onions are so good in it. 🙂 Thanks for sharing!

  4. I’m confused a bit. If you’re replanting it, you don’t get to eat it, right? I love the idea of doing it just to see it, but, if you’re putting the (white part of the) onion in the water or dirt, you can’t eat it.
    I know you can eat some of the green part, but when I use green onions, it’s the white part that I use most and maybe a bit of the green.

    1. You’re right – if you like eating the white part it doesn’t really work for you. I like the white part, but my family does not, so people who do this just snip off the green portions. It’s still a fun thing for the kiddos to see happen… I think it will work with even just a small amount of the root still there.

  5. I tried this a few years back in dirt with just the tip of the white and roots. I had it in a planter inside. It didn’t work but maybe I did something wrong. I do like the white parts, so maybe this won’t work for me, but I think I will try it anyway. The kids and I always have something growing on the window sill. 😉

  6. Hello,

    This works with garlic also. But I leave the garlic in the dark till it grows to a inch then bring it to the light. Also I cut my onions right where the white turned green. Put it in water so its almost covered but NOT covered the top. And peel off the outter “film”

  7. I love this idea!! Kids or no, this is wonderful. I love green onions and this would be a great thing to do to add to the life of the green onion.

  8. Whenever the ground is thawed I replant onion roots. I chop off just a little area above the roots when cutting onions and plant them in my garden. In a couple months I have onions again. This looks really fun for the kids! Great reusing idea and it’s visually interesting

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