Growing Onions indoors

Onions are easy to grow both outdoors and inside.  They are one of those vegetables that I never seem to have enough of because I use them every day for cooking. This article shows you how to use onions as indoor plants. Growing onions indoors is a fun project and one that the kids will love to help with.Growing Onions indoors is really quite easy. Onions are persistent and those roots just want to keep growing. See several different ways to grow onions indoors.If you don’t have the space for a  full scale vegetable garden outside, you can still grow onions indoors. You can even have an endless supply of them if you do it just right since onions are a cut and come again vegetable.  (they will regrow from the original stock with roots.)

Onions are a very persistent vegetable. They will sprout, regrow, sprout again. Just look at this basket of them. Many could be used to make new plants.Sprouted onions will re-grow

Growing onions indoors gives you and endless supply when you need them.

Here are a few of the ways to grow onions indoors.  Kids will love these projects too!Spring onions will re-growDon’t discard those old onion bottoms in the trash.  You can create an endless supply of them without ever having to buy more. This can be done with all types of onions.Onions will grow from the base and will sprout on top.

Place an onion in potting soil and it will spout new growth.  You can either slice off the onion where the roots are, or place a small whole onion on soil and it will grow, in time. When it has developed repeat the process as often as you like. 

Onions growing in water.

Onions don’t need soil to grow. If you place a sprouted onion with the roots down in a glass of water, it will continue to grow on the top with new shoots.

Onions in water with rocks

All types of onions will regrow.  One of my latest experiments was to try to grow vidalia onions from bottoms that would normally end up in the trash or compost pile. My onion sprouted quickly and gave off new growth in just a few days. Vidalia onions sprout and will re-grow easily in a pot.

The roots of onions are very persistent.  In this photo whole onion bottoms are sitting on rocks in a dish of water and the green sprouts are growing.  If you cut off the green parts, more will grow.

spring onions grow in water in one week.
This is one of my favorite ways to grow onions.  I buy one clump of spring onions at the store. Place them in a jar of water and cut just the green tops for recipes.  You will have new growth before you know it and never have to buy spring onions again.  See my tips to re-grow spring onions in water here.

Growing onions verticallyThis idea is such a fun one for kids to do.  Grow onions vertically on a window sill.  You will need a 5 liter bottle that you have made holes in. Fill it with potting soil and onion sprouts and watch your harvest grow indoors! The kids will be fascinated. Sprouted onions will grow

Onions sprout easily and that is good for getting more onions for free.  Get a 4 gallon container and add some wood chips about half way up.  Fill the rest of the pot with potting soil. (the wood chips will act as drainage.)  Keep the soil evenly moist and the sprouted onions will grow for you.  The roots on the bottom will love the new, rich soil!

This onion has sprouted and split the skin
Do you ever reach into the onion bin and find one that has sprouted where the sprout actually splits the onion?  Don’t just use part of it and discard.  Put that sprouted part to work.  Slice into the onion to expose the sprout and carefully cut the onion in two (take care not to disturb the sprout).   Carefully cut around the sprout and plant.  You can use the part not planted but will end up with another onion too! 

Have you discovered other ways for growing onions indoors?  Please share your tips in the comment section below.

  15 comments for “Growing Onions indoors

  1. 09/05/2013 at 1:52 pm

    Looks like fun!

  2. Vicki Bruni
    09/10/2013 at 10:12 pm

    I think that the idea of growing onions indoors is great!!

  3. Josey
    11/28/2013 at 4:48 am

    Wonderful idea

  4. Kathy
    08/31/2014 at 1:02 pm

    This is great I am starting right away

    • admin
      08/31/2014 at 10:20 pm

      Hi Kathy. God luck with them! Carol

  5. Tammy
    07/31/2015 at 12:51 pm

    How can I get the hole big enough for the onion to be pulled through after it’s grown – and yet not so big that the soil falls out?

    • admin
      08/01/2015 at 12:39 pm

      Hi Tammy. These are not my projects. I shared them from the site where I found them and linked to them in the article. If you follow the links to the site, they may be able to answer your questions.

  6. Edrece
    08/27/2016 at 3:13 am

    I’m Kind of confused here im only 16 and Ive just started my own vegetable garden Can Some one explain this in dummy terms

    • Carol
      08/27/2016 at 10:21 am

      Which part is confusing to you?

  7. Nadia
    04/30/2017 at 10:05 am

    If i planted a red or yellow onions​ in a pot, are they going to produce a real red and yellow onions again?! And when i should harvest them?
    Thank you.

    • Carol
      04/30/2017 at 12:54 pm

      Hi Nadia. Probably not if you keep them in a pot, unless it is large and kept outside. Onions need the coldness to develop a bulb. You could start them in a pot and then plant in the garden, but it does take months for onion bulbs to form.

      • Nadia
        05/02/2017 at 7:46 pm

        Thank you so much 🙂

        • Carol
          05/02/2017 at 9:44 pm

          My pleasure Nadia. Carol

  8. Jess
    09/09/2017 at 5:05 pm

    Do you only get one onion from the roots and sprouts.?

    • Carol
      09/09/2017 at 8:34 pm

      Yes but you can divide it again, with each part having roots and a growing tip. Carol

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