Stop buying spring onions from the supermarket - grow them in water in just 4 easy steps

How to grow spring onions in water isn’t a topic you may have considered before. But as the grow-your-own revolution continues to dominate as one of our favourite budget garden ideas, you might want to get involved. 

After all, spring onions are a popular addition to any shopping list, but many people choose to throw the all-important roots and bulbs away when they’ve finished chopping up the green tops for their salads or ramen. 

But instead of throwing these bulbs and roots onto the compost, you might want to keep them to one side. You can use these bulbs to create your own endless supply of spring onions - and you don’t even need a giant vegetable patch to do so. All you need is a sunny windowsill.

In fact, it’s so easy to grow your own spring onions that we don’t know why anyone would buy them from the supermarket!

How to grow spring onions in water

‘Spring onions are very easy to grow at home and come in very handy for many dishes,’ says gardening expert Harry Bodell at PriceYourJob.co.uk. You could even have a whole bunch at your disposal in less than two weeks. This is how to do it. 

What you’ll need

• A bunch of spring onions
• A kitchen knife or scissors - like this Heavy Duty Kitchen Shears Herb Scissors Set from Amazon
• Shallow glass jar - like these Maison & White Clip Top Glass Jars from Amazon
• Water

Step-by-step

1. Choose the right spring onions

Of course, if you want to grow spring onions in water, you’re going to need some spring onions. So, a trip to the supermarket will be in order. But instead of picking up the first bunch of spring onions you see, inspect them before you purchase them.

‘Make sure all of the onions have a few roots coming out of the bottom. The longer the roots, the faster they will grow,’ says Harry.

So, if you want spring onions as soon as possible, try and choose the bunch with the longest roots.

2. Cut off the green tops

When you have the right spring onions at your disposal, they’re perfect for two reasons. Not only will they provide a tasty addition to your dish, but they’ll also be perfect for your at-home growing project.

To start the process, use a knife or scissors to cut the green tops off the spring onions, leaving around two to three centimetres from the root. You can eat the tops, but keep the remaining bulbs (and the roots) intact and to one side. 

Note: Although it makes sense to use the scraps when growing spring onions, you don’t have to use the green tops in order to grow spring onions in water. You could leave them full-size before moving on to the next step if you prefer. 

3. Place the roots in fresh water

When you have the ends of the spring onions ready to go, you then need to submerge them in water to help them grow. 

To do this, stand the ends root-down into a shallow glass jar. Ensure that they’re all able to stand up without falling over, and then add in some water. You want to make sure that the roots are fully submerged in water, but that part of the bulb is still kept above water. Then, place your jar on a sunny windowsill.

Note: If you have kept your spring onions full-size, it’s better to use a full-size mason jar instead of a shallow one - like these Yishik 6 Pack 16oz Mason Jars from Amazon.

4. Refresh the water and harvest

Spring onions normally start to re-shoot after around 3 - 7 days, which means that you never have to wait too long for your next harvest. However, you do need to take care of them during this time.

‘Whenever the water starts to look a bit off, change it for fresh water. It’s usually best to do this every other day,’ says Callum.

If you do this, you should find that new spring onions start to grow from the top of the bulb. And when they’re large enough, you can cut them off and use them for your next meal. 

Who new getting vegetables and plants for free could be so easy? Once you've mastered spring onions, why not try propagating your own ginger at home too?

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