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You are here: Home / Gardening / Planting Sprouted Onions

Planting Sprouted Onions

June 11, 2018 by Ashley Adamant 67 Comments

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We’ve all had it happen. That rogue onion that manages to hide at the back of the bin.

Once onions come out of cold storage and hit the supermarket shelves, it’s only a matter of time before they wake up and start trying to grow.  The outside will become dry and papery, and the whole onion will shrink as it puts stored energy into trying to make one last go at life.

Once an onion has sprouted, there’s nothing wrong with eating it.  Provided it’s not actually spoiling or molding, it’s still fine to cut up for dinner. 

The problem is, there isn’t much usable onion inside at this point.  Rather than trying to eat it, it’s better to invest in a good crop of future onions.  If you can plant it, you’ll reap a reward 3 fold by the end of the season.

Sprouted Onion for planting

Dividing a Sprouted Onion for Planting

Onions are usually grown from seed, and a sprouted onion needs to be divided to grow properly.  After the first growing season, if that onion had stayed in the ground instead of being harvested, it would have divided into multiple onions all on its own. 

Each individual onion would be a bit deformed, as it competed for space with the others.  By separating them, each onion can grow into a full-sized bulb, and allow you to harvest far more than you planted.

Start by peeling back the outer paper of the onion.  Once inside, you’ll see that the onion has already started to section itself off into multiple onion plants.

Dividing Sprouted Onions for planting

Once you’ve peeled everything off, you should have multiple distinct onion sprouts.  I had two onions sprouting in the back of my bin, and each of them had three individual onion divisions inside. 

It’s not necessarily always going to be three, which makes it a bit of a mystery hunt.  Even if you only have 1 or 2 green stems coming out the top, there may be other smaller plants inside that haven’t popped yet.

Sprouted Onion Separated for Planting

How to Plant a Sprouted Onion

At this point, you have tiny onion plants.  In cold regions with a short growing season like ours here in Vermont, it’s actually common for gardeners to order in small onion plants like this from warm growing regions like Texas.  With that in mind, actually planting a sprouted onion isn’t that strange a concept.

Onion sets, for example, are just small onion plant starts that have been harvested and cured to suspend their growth until they’re replanted.  Onions are pretty durable, and even after you’ve basically ripped them apart and removed half their layers, they’ll still likely grow without issue.

Once divided, sprouted onions can be planted directly into the garden or potted up indoors.

Planting Sprouted Onions

Onions can handle a light frost and are generally planted outdoors from seed about a month before the last spring frost. 

Your plants, however, have been tucked away cozily indoors and cold spring weather will be quite a shock.  If it’s early, try potting them up and gradually introducing them to the outdoors to harden them off.  If it’s mid-winter in a cold area, they’ll need to be grown completely indoors in pots until you harvest.

Onions are pretty easy to grow, but they can’t handle weedy competition and they need ample water in well-drained soil.

Sprouted Onion Regrowing in the Garden

The time to harvest your new, full-sized onions will depend on how big their initial bulbs were at planting, and the onion variety.  Generally, onion plants give you a head start on the season as compared to planting a seed, and gardeners harvest onions from started onion plants about 65 to 80 days after planting.

Keep an eye on your plants, weed them regularly and water them every few days.  Soon enough, you’ll have several onions to replace that sprouted onion from your pantry.

How to Plant a Sprouted Onion ~ Planting Sprouted Onions in the Garden #onions #growingonions #gardening #gardeningtips #organicgarden #vegetablegardening #frugalgardening #homesteading

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Filed Under: Gardening, Saving Money

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Reader Interactions

Comments

  1. Lorena

    August 28, 2018 at 11:29 pm

    Thanks! I will give it a go!

    Reply
  2. Kiaya

    September 18, 2018 at 8:25 am

    I had an onion that got lost at the back of my crisper and this is perfect for it! Only has two small sprouts at this stage, thinking I will leave it for another day or two before splitting it! I live in sunny Queensland, Australia and the climate will hopefully be super easy for it to grow! Going to pop it beside my corn and parsley!

    Reply
    • Brittany Rollins

      April 29, 2020 at 6:17 pm

      I planted mine outside after it sprouted in my fridge. I left it planted outside for two weeks with regular watering until it had about 20-25 green stems. Then carefully dug it up and split it. I get at least 6 onions sprouts out of it every time.

      Reply
      • Leanne

        March 7, 2021 at 6:45 pm

        Don’t store onions/potatoes in your fridge! Put them in paper bags (not plastic) with a few holes cut in the bag. Cool dark place is best and they will last MUCH.longer!

        Reply
        • Mueller Sharon

          May 20, 2022 at 2:50 pm

          Thanks! Didn’t know this..hubby ordered a huge bag of onions and one of potatoes from his home town in northern Germany (we live in central Germany). He tends to over order. I didnt know what to do with all the onions, so put them in the veggie drawer. Now I‘ll transfer to paper bags with holes, and store in our back room. Its dark and houses the utility meters, wine and beverages, etc. Great!

          Reply
  3. Parth

    January 10, 2019 at 4:42 am

    i try it but it will take how much time ??

    Reply
    • Ashley Adamant

      January 10, 2019 at 2:37 pm

      Quite a while for full sized onions. Those are generally about 100 days from planting. That said, after about a month in the ground they’ll have put on a good bit of growth and you can harvest a smaller onion anytime from 30 days on.

      Reply
      • Ann

        March 23, 2019 at 3:40 pm

        Appreciate this info. Can’t wait to see my return thank you

        Reply
    • Kad

      March 23, 2021 at 11:28 pm

      How is the plant or plants doing

      Reply
  4. Terry Delveaux

    January 26, 2019 at 4:34 pm

    After reading a Vermont farming book , I am intrigued with the natural way of making money, I do composts with all of nature in it I mean all of nature curing together for two years making the the strongest fertilizer on the planet. you have Ideas I will be using and have done many. The more Ideas with nature will make me even stronger.

    Reply
  5. nancy

    February 20, 2019 at 5:29 pm

    Thanks, have always wanted to grow onions and nows my chance

    Reply
  6. Jenni B

    December 17, 2019 at 12:07 pm

    Walked into my kitchen last night to find two brown ones had gone off managed to get 5 bulbs out 😍 as a new found green thumb I got overly excited haha

    Reply
  7. Doreen & John

    February 16, 2020 at 9:57 pm

    Great info. You’ve inspired us to plant our sprouting onions in pots! Enjoying your blog!

    Reply
  8. Monica

    April 11, 2020 at 8:10 pm

    Can I eat the green sprouts?

    Reply
    • Ashley Adamant

      April 11, 2020 at 10:18 pm

      Yes. Onion greens are edible (and tasty). Just watch out, if they get too old they’ll start to spoil and get slimy/brown, so be sure they’re fresh (just like any other produce).

      Reply
  9. Tas

    May 12, 2020 at 2:40 pm

    I had a sprouted onion, i sliced the bottom quarter off and placed it in water to encourage new root growth. And as for the rest of the onion I peeeled away the layers and separated the sprouts – although the sprouts are no longer connected to the roots (they have raw flat ends after being cut) will they still grow new roots? Should I put them in water first before planting them?

    Reply
    • Administrator

      March 2, 2021 at 5:55 pm

      I would think that you would need to keep the roots intact but I am curious to know how it turns out.

      Reply
  10. Helen

    May 20, 2020 at 8:36 am

    Hello, I’m trying to separate the sprouting parts of an onion – but how do you separate the sprouts so each sprout has some of the root – just tear them apart and hope for the best ? Or is there a better technique?

    Reply
    • Ashley Adamant

      July 11, 2020 at 1:45 am

      Yup, tear them apart and hope for the best is my technique and I haven’t had one fail yet.

      Reply
      • Helen

        July 11, 2020 at 7:05 am

        Hello Ashley,

        Thanks for the advice, I’ll do just that.

        Helen

        Reply
  11. Natali Gaines-Fields

    May 21, 2020 at 5:34 pm

    Hello, I planted the whole onion and it sprouted. Should I still divide it or will it still produce onions?

    Reply
    • Ashley Adamant

      May 31, 2020 at 7:26 pm

      If they’re right on top of eachother they’ll likely not produce full onions, and if you didn’t peel the outside off, mostly likely it’ll just use that energy to produce seed heads. Onions are biennial,and if re-planted whole they’11 usually just go to seed. The reason for separating them and removing the onion flesh around the outside is it kicked them back to their first year and they’re more likely to produce onions instead of seed heads.

      So, that’s a long answer, but if you want a better chance of onions, dig it up and divide it. (The flowers are really beautiful though, like more than you’d imagine from a common kitchen onion, and the bees love them, so you can just leave it as an ornamental.)

      Reply
  12. Michelle

    May 22, 2020 at 8:53 pm

    Thank you! I have planted an onion I named Manny, and now he is a wee little onion sprout in a pot. I hope to update you on his growth. Good luck to you

    Reply
  13. Michelle

    June 2, 2020 at 9:05 pm

    I live in the PNW, is it still too harsh to plant them outside directly in June?

    Reply
  14. Edgar JEFFRIES

    June 17, 2020 at 3:37 am

    Here in England we call those scallions but you must use organic as cmmershal are sprayed to stop them sprouting we plant the whole bulb then separate when we harvest about July they tend to be hotter with more flavor

    Reply
  15. Gabriella Saghy

    June 17, 2020 at 10:51 pm

    How deep should we plant the bulbs? Also, is it like garlic in the sense that I can plant the bulbs just before winter and harvest in spring?

    Reply
    • Ashley Adamant

      July 11, 2020 at 2:59 pm

      Plant the bulbs so that the whole bulb is in the ground and the stem sticking out. You can plant them in the fall, yes, but they’ll take a whole season the next year to make bulbs. You’ll be harvesting them in late summer or early fall.

      Reply
  16. Dortrean

    June 18, 2020 at 1:48 am

    You can cut roots off the bottom and plant them and have more plants

    Reply
    • Ashley Adamant

      June 19, 2020 at 2:21 pm

      Haven’t tried that method, but good to know!

      Reply
  17. Samantha

    July 17, 2020 at 11:07 pm

    I found a sprouted onion in my fridge that I’d like to plant. It’s July and will get cold in a few months, is it too late to plant them in the ground? Should I put them in a pot instead? How big of a pot will I need? How many onions will one onion produce? Thanks!

    Reply
    • Administrator

      February 19, 2021 at 6:10 pm

      You could probably plant them outside but they won’t have time to get very big at this point. I would keep them inside in a pot and then in the spring you should actually have more sprouts to plant out. You can typically get somewhere around 3 sprouts per onion but it just depends.

      Reply
  18. Olutayo Okutubo

    November 24, 2020 at 2:48 am

    Can you just put it in water instead of in the dirt?

    Reply
    • Ashley Adamant

      December 28, 2020 at 3:49 am

      They’ll need nutrients to grow into full-sized onions, but I’d imagine you could rig it so you could grow them hydroponically on a windowsill in water like that. What to add to make it work, I can’t say.

      Reply
  19. April Kelly

    January 8, 2021 at 11:39 pm

    I placed the bottom of an onion in water after cutting and using it to cook with. Three stems sprouted. I separated them and placed them in dirt. Can I expect to see bulbs?

    Reply
    • Ashley Adamant

      January 10, 2021 at 8:38 pm

      You should, assuming they get enough sun. Good luck!

      Reply
  20. Ryan Shoemaker

    January 13, 2021 at 12:07 am

    Thanks. We always buy a bag of them and always have a few go “bad”. Just walked into my pantry and saw this time was the same. Thanks to a quick Google search and your information I hope to start growing my own. Psyched to try it out. Now to figure out planting squirrels. 😉

    Reply
    • Admin

      January 13, 2021 at 12:46 am

      Awesome! I hope you enjoy it!

      Reply
  21. Deb Franklin

    January 23, 2021 at 5:54 pm

    I am eager to try this. I have a couple that have sprouted and look ready to produce. About planting the roots that some have mentioned. I recently started cutting the root end out of the onion when prepping to cook. The reason is that I don’t like to have the root end in my dishes. I noticed that if I don’t cut it completely, a little sprout (if there is a sprout which I suspect has something to do with the time of year) usually comes out with the root. I have two sitting in a shallow water until I can get them planted. It’s an experiment. Can’t wait to see how both methods work. Hoping they grow well cause my family loves onion in everything.

    Reply
    • Administrator

      March 2, 2021 at 5:53 pm

      I love that you are experimenting with them. Let us know how it turns out.

      Reply
  22. Beth Reckinger, Az

    February 12, 2021 at 11:32 pm

    Trying for the 1st time in pots. I have 2 sprouting onions s that I’m going to separate and see how many are inside. Super excited to give this a shot! Thanks for all the info!

    Reply
    • Administrator

      February 16, 2021 at 8:17 pm

      That’s great. So glad you enjoyed the article.

      Reply
  23. Marianne Nichols

    February 18, 2021 at 5:48 pm

    How deep do you plant the bulb? Do you plant it so just the green is showing or deeper than that? If I have multiple onion pieces to plant, how far apart should I plant them?

    Reply
    • Ashley Adamant

      February 21, 2021 at 5:09 pm

      You plant them so the bulb is underground but the green is sticking up. I’d put them about 6 inches apart.

      Reply
  24. Trish Rose

    February 28, 2021 at 9:01 pm

    Hi, this post has been so helpful, thanks! A question I have though is if I plant my sprouted onion bulbs into a pot (it’s February in Michigan) could I transplant them later to the garden in the Spring, or would they not do well being dug up once in a pot?

    Reply
    • Administrator

      March 2, 2021 at 5:52 pm

      You should definitely be able to transplant them into the garden.

      Reply
  25. Christine

    March 2, 2021 at 4:53 pm

    Thank you-I planted one not knowing that I should separate the inside ones-seeing very soon my mistake-I’m really just growing the green sprouts….question: the green sprouts I have are large and numerous….can I not use them in cooking as well? Like for example use them the same way you might use chives? (chopped on something) because they certainly have an onion-y smell to them

    Reply
    • Administrator

      March 2, 2021 at 5:52 pm

      Yes you can definitely do that.

      Reply
  26. Corine

    April 3, 2021 at 1:34 pm

    I am in Texas and the sun can get really hot. Should these be planted full sun or partial? Morning or event sun? Thank you!

    Reply
    • Administrator

      April 6, 2021 at 6:48 pm

      You want to be sure that your onions receive 6 to 7 hours of sunlight.

      Reply
  27. Tati

    April 5, 2021 at 3:28 pm

    I don’t have enough room in my garden. Would I be able to grow them in a big pot outside in the sun? If so how big of a pot and how deep? Thank you!

    Reply
    • Administrator

      April 6, 2021 at 6:47 pm

      You want your pot to be at least 10 inches deep and as wide as you can get it. The wider the pot, the more onions you can plant. You need about 3 to 4 inches in between each onion to allow them proper room to grow.

      Reply
  28. Jessica

    April 9, 2021 at 9:53 am

    I’m In Scotland and the weather can be sometimes warm/ sunny or super cold. ( mainly cold and wet though even just now in the spring it’s been 2/3 degrees Celsius but the sun has been shining)
    Where am I best planting? Will they be okay outside?
    ( I will be using a pot)
    Just found a sprouted onion and really want to try to plant it! Never planted anything before so im a complete newbie.
    Also is there a best soil to use?

    Thanks

    Reply
    • Administrator

      April 21, 2021 at 5:27 pm

      If you are planting them in a pot, I would keep them indoors until they get established. Once you are ready to move them outdoors, you can place them outside for small periods of time and gradually increasing the time each day to harden them off. You can use any kind of potting soil to pot them up.

      Reply
  29. Terry Ann Robinson

    April 18, 2021 at 5:48 am

    THANKS FOR THIS INFORMATION, I LIVE IN SOUTH CAROLINA, WHEN WOULD IT BE SAFE FOR ME TO PLANT MY SPROUTS OUTSIDE?

    Reply
    • Administrator

      April 21, 2021 at 5:25 pm

      They can handle a light frost. But if they have been in the warm house, the cool spring temperatures can be quite a shock. You may want to try planting them in containers and allowing them to gradually harden off before planting outside.

      Reply
  30. Becky

    July 28, 2021 at 2:53 am

    So I found a sprouting purple onion at back of crisper. The sprouts are pretty good size 5-6 inches. Its end of July here in NC, region 8. Wondering if I put them in ground will they thrive or should I put them in a planter pots? Also how often and how much watering do they need. Help!

    Reply
    • Administrator

      July 28, 2021 at 3:52 pm

      I think you can definitely plant them outside.

      Reply
  31. KATHLEEN MASSARO

    September 26, 2021 at 1:55 am

    I found a sprouting sweet onion in the bag. I live in Central Florida. Can I plant it outside in the ground now and if so how long before I can harvest? Thank you.

    Reply
    • Administrator

      September 27, 2021 at 3:44 pm

      I would think that you can still plant them out in your area. They can handle a light frost. Typically onions are harvested 65 to 80 days after planting. It will depend on how big each of your initial bulbs are when you plant them. The bigger they are when you plant them, the sooner they can be harvested.

      Reply
  32. Tawnya Cyphers

    January 25, 2022 at 8:32 am

    Thank all of you for this wonderful information!!! I stumbled across this article through the reference section of a Wiki-how article.

    Since the pandemic began my husband does the majority of the grocery shopping as he’s trying to protect me. Awesome! You’ll find me in the garden. I grow, he cooks, I clean up. Well, I hadn’t been paying any attention to what he has been buying in awhile. Then tonight I accidentally dropped a can on the pantry floor and was shocked to discover ten sprouted onions of all varieties. I can’t wait to try and grow our own!

    My question is, do different types of onions have different nutritional needs if grown in pots? Thank you!!!

    Reply
    • Administrator

      January 26, 2022 at 8:25 pm

      It sounds like you and your husband have a great system going there. The onions should all do very well in the same soil regardless of the variety.

      Reply
  33. Collet Crabill

    March 13, 2022 at 12:02 am

    I have a couple of onions that have started to sprout. The red onions are organic, the sweet onion is not. We had snow today, like you, but the next few weeks look good. I’m thinking of starting them indoors, hardening them off and then planting…when is the best time to plant? I’m a 6b according to the USDA. I’m thinking after I harden them off in pots I can plant them and they will be good to go. Thoughts?

    Reply
    • Administrator

      March 14, 2022 at 3:57 pm

      They can actually tolerate light frosts and you can plant outside a month before the last frost date so you should be pretty close the that now. I would save myself a lot of work and plant them outside within the next week or so.

      Reply
  34. Susan Mene

    June 1, 2022 at 12:37 am

    I started by planting a sprouted onion; now I cut the ends off every onion I use, place them in water till little white roots appear, and plant them. What a crop I had going! Well, somebody beat me to the harvest; I believe it was Mr. Squirrel that dug up and presumably ate my onions and half my garlic. If I encounter a squirrel with bad breath, there’s gonna be a showdown!

    Reply
    • Administrator

      June 6, 2022 at 7:32 pm

      Oh no. Ha Ha!

      Reply
      • Susie

        August 20, 2022 at 11:58 am

        That is funny. We have gophers… not sure if my onions will make it. But it is worth a try.

        Reply
  35. Joni

    October 19, 2022 at 10:22 am

    A sharp knife and clean cuts is always preferable.
    Same as any other bulb.
    A garden is a health hospital for the body and mind. What happens in a surgery when you use blunt dirty tools and take them from one area to another?
    The way a person gardens tells a lot about their mind and level of conscious awareness.

    Some people stomp around & never even think about what their feet are really doing,
    I even know a man who swears he’s a professional yet plants everything with the root mass 1/2 out of the ground and wonders why his plants die and struggle to even live. Simply… the man is ungrounded in himself and absent minded in his connection to the physical. Half here.

    Reply

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I’m an off-grid homesteader in rural Vermont and the author of Practical Self Reliance, a blog that helps people find practical ways to become more self-reliant. Read More…

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