Regrow Spring Onions in Water – Fun Gardening Hack

I use spring onions all the time when I cook.  They have a very mild flavor that is perfect as a garnish and also makes a lovely sauce for most proteins.  So I like to have them on hand. Growing onions is a pretty easy from a gardening standpoint, but did you know that you can also regrow spring onions in water?Spring onions are one of the easiest cut and come again vegetables. In a week, you will have more growth to use in cooking.

Several years ago, I was watching The Next Food Network Star show and one of their quick fire challenges was to give a quick kitchen tip.  One of the contestants talked about regrowing spring onions in water so that you would never have to buy them again.

I had my doubts, but tried the project and found that it worked like a charm!  Not only that, it’s an easy project, fun for the kids to help out with and gives brings the outdoors inside as well.

Don’t have a garden where you can grow spring onions outside?  That doesn’t matter.  You can actually regrow store bought spring onions, as long as they have a some of the roots left on each plant.Store bought spring onions will regrow

Here is how to regrow spring onions in water.

Sort out your onions, making sure that all of the onions have a least a few roots growing from the bottom. Take out any that don’t and save them for cooking later. The longer the roots are, the better for fast growth.The longer the roots are, the quicker the onions will regrowTrim the tops of the onions and place them in a glass of clear water with the water just above the point where the onions start to turn green. I find that the water stays fresh longer if I don’t have it all the way up where the green tips are.  Any kind of see through jar will work. Mason jars are decorative, small clear vases work, or even a plain clear water glass. You will want to be able to see what is happening as the spring onions regrow.Spring onions in a glass of water.

As you need spring onions for cooking, just cut off the green part of the onions above the water line and leave the base in the onion jar. Change the water when it starts to get a bit funky. Every other day works for me.  Keep the container near a sunny window if you can, so that the onions get some light.Change the water every few days in order to regrow spring onionsIn a few days, the onions will start regrowing from the cut area.  You can re-cut again and again!  Free onions forever! (as long as you remember to change the water.) My first shoots appeared in about 3 days.  Spring onions growing new shoots

My daughter knows how much I love to regrow spring onions in water. She gave me a small onion jar where I can keep my cut onions until they grow again.  This way, I have one jar of them growing new onions and the other with water keeping my onions fresh until I use them for cooking.spring onions grow in water in one week.

It only takes a few days before you see the new growth and in about a week, you’ll have a bunch of new spring onion shoots.

These are the roots of the spring onions at just about 10 days.  They are so much longer than when I put them in the jar of water!new roots on spring onions

The beauty of this project is that you can do it over and over again.  Regrowing spring onions means that you’ll never have to buy them again! Just be sure that you change the water every few days. If you don’t, the whole bottom area will get decayed and mushy. It is THAT easy to regrow spring onions!Spring onions are one of the easiest cut and come again vegetables. In a week, you will have more growth to use in cooking.

Why won’t my spring onions regrow?

If you have trouble getting the spring onions to regrow, it could be one of these causes:

  • The water is dirty. Be sure to change it every few days
  • You have cut them too close to the root. Leave quite a bit of the white part for best results
  • Not enough water.  If the onions water is too low, the onions will dry out and won’t grow.
  • Too much water.  Don’t have the water level too high.  Cover just the bottom area and let the new growth occur above the water.
  • Not enough sunlight. Move closer to a sunny window. Plants need some light to grow.

For more garden hacks, see my Garden Art and Recycling Board on Pinterest.

Disclosure of Material Connection: Some of the links in the post above are "affiliate links." This means if you click on the link and purchase the item, I will receive a small commission from the sale, but the price is the same for you. I am disclosing this in accordance with the Federal Trade Commission's 16 CFR, Part 255: "Guides Concerning the Use of Endorsements and Testimonials in Advertising."

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  7 comments for “Regrow Spring Onions in Water – Fun Gardening Hack

  1. 02/16/2017 at 2:14 pm

    I am new to this kitchen duty of re-growth and your essay sure helps. The internet is loaded with how-to’s but one has to sort through them to find the most reliable. I’m encouraged by how far down the stalk you cut them so I will do so myself. I read your onion instructions and might try them out one of these days. I just found out about lettuce re-growth, also. Your pot for the green onions is very pretty! Thank you from wintry Quebec, Canada.

    • Carol
      02/16/2017 at 2:43 pm

      Hi Salma. Thank you for the kind comment. This trick is one of my favorite. The onions don’t last forever (It is easy to forget to change the water.) But you will get them to grow over and over again. That onion pot is my favorite thing. My daughter gave it to me for just this purpose! Carol

      • 02/16/2017 at 6:02 pm

        HI Carol and thanks for posting my comment. I read your post about growing the onions in the windows. Pretty interesting! I had no idea that was possible as its so true about stores selling old produce and onions can be hit or miss. Do you have any problems with bugs with these indoor gardens? I was just curious as I brought my Chive plant inside at the end of the fall and these small black things appear out of nowhere. The year before it was parsley and it was just terrible with the same bugs. My other new indoor garden venture is sprouting Mung beans. I had no idea that it was so popular. I used Youtube extensively but only found 2 useful tutorials and wound up finding realistic instructions in my Joy of Cooking cookbook. My 1st batch was thrown out but the 2nd is looking better. With either Green Onions or Mung Beans, its a relief since it can be a chore to visit the grocer only to spend $.50 but spend twice as much on gasoline!! Many thanks for your patience with my many wordy.

        • Carol
          02/16/2017 at 9:48 pm

          People on the internet pass information on without actually trying it themselves. If you actually try it out, you know it works. I have some vidalia onions that I have managed to sprout. Now I am just waiting to see what happens and whether they actually do grow. I’ve have sometimes had problems with bringing bugs in from the outside in the fall. You have to check the plants carefully. Carol

          • 02/28/2017 at 6:15 am

            Yes, so true about the flood of material on the internet. I am pleased to share that a red onion scrap has sprouted. It took less than 2 weeks. What a nice feeling to do it yourself and actually have a result.

          • Carol
            02/28/2017 at 9:49 am

            I have a vidalia onion that is growing right now. It needs to go in some different soil already since it needs a lot of watering in the seed starting mix. Carol

  2. Jess
    02/17/2017 at 11:35 pm

    Carol-
    Your how to was clearly written and highly informative. Are you willing to share your recipe for spring onion cream sauce? I enjoyed reading your blog thank you.

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