This method works equally well with common yellow, red, or white bulb onions, as well as with green onions or scallions\u2014so don\u2019t worry about picking just the \u201cright\u201d type. If it\u2019s sprouting, it\u2019s suitable! Many people find that green onions, in particular, are incredibly easy to regrow multiple times from the root ends. You can snip the fresh new greens for garnishes, stir-fries, or salads, often in just a week or two. Bulb onions take a bit longer, but with patience and proper conditions, you may be able to coax a small new bulb from a leftover tip.<\/p>\n
Of course, results can vary. Regrowing store-bought onions often yields fresh, vibrant greens for months, while producing a new full-sized bulb from a discarded onion base is less common but possible\u2014especially if you plant them outdoors in good soil. Even if you don\u2019t get a prizewinning bulb, the greenery alone adds flavor and satisfaction to your meals. For beginners and seasoned gardeners alike, regrowing onions from scraps is a simple, low-risk way to get started with home gardening, reduce waste, and enjoy a taste of self-sufficiency\u2014all with something you\u2019d otherwise toss in the trash.<\/p>\n
What You\u2019ll Need to Plant (or Regrow) an Onion<\/h2>\n
![\"What](\"https:\/\/cultivatedearth.com\/wp-content\/uploads\/2026\/01\/What-Youll-Need-to-Plant-or-Regrow-an-Onion.jpg\")
<\/p>\n
To start your onion-growing project, gather a few simple supplies: you\u2019ll need leftover onion bottoms (the root end you usually toss) or sprouted onions that have started to green in your pantry. A sharp knife is key for safely trimming the onion and removing any decayed layers.<\/p>\n
Choose a container like a pot with drainage or a spot in your garden bed, and fill it with fresh, well-draining potting soil. Keep water handy\u2014regular moisture is essential for successful regrowth.<\/p>\n
For indoor setups or to give your onions an extra boost, optional items such as rooting hormone, plant fertilizer, and a grow light can help your onions thrive, especially if sunlight is scarce.<\/p>\n
When selecting onion scraps to plant, pick firm, healthy-looking roots or bulbs without moldy spots or a mushy texture\u2014these show vitality and are more likely to sprout. If using an onion that\u2019s already growing green shoots, even better: just trim the top down to an inch above the roots and plant directly in soil.<\/p>\n
Whether you\u2019re working with a leftover onion bottom or a sprouted bulb, check for signs of rot and avoid any pieces that are too dried out\u2014they won\u2019t regrow well.<\/p>\n
With these simple supplies and a few minutes of prep, you\u2019ll be ready to give your kitchen scraps a second life and enjoy home-grown onions in no time.<\/p>\n
Step-by-Step Guide: Planting a Sprouted Onion or Onion Bottom<\/h2>\n
![\"Step-by-Step](\"https:\/\/cultivatedearth.com\/wp-content\/uploads\/2026\/01\/Step-by-Step-Guide-8.jpg\")
<\/p>\n
Planting a sprouted onion or using an onion bottom is an easy way to grow fresh onions at home, even if you\u2019re new to gardening. Start by checking your onion: if you see green shoots coming out from the top, it\u2019s ready to plant.<\/p>\n
Trim away any soft, mushy, or moldy parts with a clean knife, leaving only the healthy sections. If your onion has several green sprouts, you can gently separate them to create multiple new plants\u2014just be careful not to damage the tiny roots attached to each sprout.<\/p>\n
For onion bottoms\u2014the root end and lower part left after using most of the onion\u2014cut them off cleanly, making sure there\u2019s about an inch of onion flesh above the roots.<\/p>\n
Planting in Soil<\/h3>\n
Choose a well-draining pot or a garden spot with loose, fertile soil. Plant the sprouted onion or onion bottom root-side down with just the green tips poking out above the soil. Space them 4-6 inches apart and bury them about 1-2 inches deep.<\/p>\n
Starting Onions in Water<\/h3>\n
If you want to start your onion in water, place the onion bottom root-side down in a shallow bowl with just enough water to cover the roots\u2014avoid submerging the whole base. Use toothpicks around the edges if necessary to keep it balanced above the water. Change the water every couple of days to prevent mold and rot.<\/p>\n
Soil vs. Water Growing<\/h4>\n\n- Growing onions in soil usually yields stronger, larger bulbs thanks to better access to nutrients.<\/li>\n
- Water-growing is great for rooting or when you don\u2019t have garden space, but onions often stay smaller and may not form full bulbs.<\/li>\n<\/ul>\n
Care Tips<\/h3>\n
Keep your onions in a bright spot with at least 6 hours of sunlight daily, like a sunny windowsill or balcony. Water soil when the top inch feels dry\u2014don’t overwater to avoid rot. If growing in water, monitor water levels, add fresh water as needed, and keep it clean.<\/p>\n
With a little patience and regular care, your onions will grow new shoots, and in time, you might enjoy fresh green tops or whole onions right from your home garden.<\/p>\n
Caring for Your Growing Onion Plant<\/h2>\n
Caring for your growing onion plant is all about consistency and attention to its changing needs. Onions love sunlight, so pick a spot that gets at least six hours of direct sun each day\u2014windowsills work well for indoor plants, while outdoor beds or containers should be placed in a sunny area.<\/p>\n
Water onions regularly but avoid overwatering, as soggy soil can lead to rot. Aim to keep the soil evenly moist, allowing the top inch to dry out before watering again. Fertilize every two to three weeks with a low-nitrogen fertilizer to encourage bulb development, but always follow package instructions to prevent burning the plants.<\/p>\n
Healthy onions grow upright with firm, green leaves. Yellowing, wilting, or drooping can indicate overwatering, nutrient deficiencies, or fungal issues, so check your plant\u2019s environment if you notice these signs.<\/p>\n
Indoor Onion Growing<\/h3>\n
For indoor onion growing, use a pot that\u2019s at least six inches deep and has good drainage. Make sure the room temperature stays between 60\u201375\u00b0F for optimal growth.<\/p>\n
Outdoor Onion Growing<\/h3>\n
Outdoors, choose a well-draining bed and watch for pests like onion maggots or thrips. Using yellow sticky traps and performing regular inspections will help catch problems early.<\/p>\n
Transplanting Onions Outdoors<\/h4>\n
When starting onions indoors, transplant them outdoors after the last frost, when seedlings have three to four leaves and are about six inches tall. Gently harden off your plants by setting them outside for a few hours each day over the course of a week. Then, transplant them into prepared soil at least four inches apart, being careful not to damage delicate roots.<\/p>\n
With these steps, you\u2019ll set your onions up for a healthy growing season, whether inside or out.<\/p>\n
Harvesting and Using Your Homegrown Onions<\/h2>\n
Knowing when to harvest your homegrown onions is key to enjoying the freshest flavors. For onion greens, start snipping when the shoots are 6-8 inches tall\u2014think of them as scallions for salads, omelets, or garnishes. To harvest, use sharp scissors to cut the greens an inch above the bulb, allowing them to regrow for several rounds.<\/p>\n
Full onion bulbs are ready when the tops begin to yellow and naturally tip over; leave them in the soil for another week to help the bulbs mature. Harvest on a dry day by gently loosening the soil with a fork and lifting the bulbs out by hand, brushing off excess dirt but avoiding damage to their skins.<\/p>\n
After curing in a warm, airy spot for two weeks, your onions are kitchen-ready. Fresh onions add amazing depth to salsas, soups, stir-fries, and salads\u2014try slicing just-harvested bulbs into sandwiches or roasting them whole with olive oil for a sweet, caramelized treat.<\/p>\n
Regrowing Onions from Scraps<\/h3>\n
For an endless supply, don\u2019t toss those onion scraps! Place the root end of your onion\u2014about an inch and a half long\u2014in a cup with just enough water to cover the roots. Set it on a sunny windowsill, changing the water every few days.<\/p>\n
In a week or two, you\u2019ll see new greens sprout, and you can plant the regrown root back into soil to foster a whole new bulb. This simple practice recycles kitchen waste and keeps the onion harvest going, turning each bulb into multiple meals throughout the season.<\/p>\n
Tips & Troubleshooting for Best Results<\/h2>\n
To get the most from your onion regrowth efforts, start by placing your onion scraps or bulbs in a clean jar or shallow dish with just enough water to cover the roots. Change the water every two to three days to prevent rot and bacteria buildup.<\/p>\n
Position your jar in a bright, sunny spot, such as a windowsill, and rotate it every few days so each side gets equal access to sunlight. This helps your onions grow straight and strong. Avoid overcrowding the container; give each bulb or scrap a little space so the roots and shoots don’t compete for nutrients and air, which can slow growth.<\/p>\n
One common challenge is slow sprouting, often caused by low light, cold drafts, or using old scraps. Try moving the jar to a sunnier, consistently warm location, and always use firm, healthy onion pieces for the best results.<\/p>\n
If your onions start to bolt and send up flower stalks, cut these off at the base to redirect energy back to leaf and root production. Flowering usually means the onion is stressed, often from extreme temperature changes, so aim for stable room temperatures and consistent care.<\/p>\n
Pests like gnats or mold can also appear in standing water. Combat this by rinsing the bulbs and changing the water more frequently, or consider transferring them to soil sooner for added protection.<\/p>\n
The best time of year to start onions from scraps is early spring, when natural daylight increases and temperatures rise. However, indoor cultures can work year-round if you provide supplemental lighting and warmth.<\/p>\n
With these simple tips and some patience, you can enjoy an endless cycle of fresh green onion growth right on your kitchen windowsill.<\/p>\n
Frequently Asked Questions (FAQs) about Regrowing Onions<\/h2>\n
Regrowing onions is a simple and rewarding project, but it\u2019s good to know what to expect before you start. If you\u2019re regrowing green onions (also called scallions), you can snip the tops and place the white roots in a glass of water\u2014a fresh batch of tasty green shoots will appear in as little as a week!<\/p>\n
For bulb onions, the process takes longer and results may vary. If you plant the bottom root section of a bulb onion in soil, you\u2019ll often get green onion shoots rather than a new full-sized bulb. While it\u2019s possible to eventually grow new bulbs, it can take several months, and success depends on factors such as variety, climate, and whether the onion was previously treated to prevent sprouting.<\/p>\n
Alternatively, planting a whole sprouted onion in the ground can give you a better chance of producing new bulbs. As it grows, the sprouted onion sometimes splits, forming several small bulbs called \u201csets,\u201d which you can harvest or replant.<\/p>\n
Keep in mind, regrowing onions is more reliable if you use sets or seeds from the garden center, especially if you\u2019re hoping for full-sized bulbs.<\/p>\n
For more detailed onion regrowing guides and troubleshooting tips, check out trusted gardening sites like The Old Farmer\u2019s Almanac<\/em> or local extension service websites. Don\u2019t be afraid to experiment\u2014each attempt helps you learn more about your plants and your garden\u2019s conditions.<\/p>\n","protected":false},"excerpt":{"rendered":"Introduction Did you know you can regrow store-bought onions right on your kitchen counter or windowsill with very little effort? Whether you want to cut down on food waste or save a few extra dollars at the grocery store, learning how to regrow onions from kitchen scraps or sprouted bulbs is an easy and surprisingly … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":9065,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-9066","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-onion"],"_links":{"self":[{"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/posts\/9066","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/comments?post=9066"}],"version-history":[{"count":3,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/posts\/9066\/revisions"}],"predecessor-version":[{"id":15831,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/posts\/9066\/revisions\/15831"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/media\/9065"}],"wp:attachment":[{"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/media?parent=9066"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/categories?post=9066"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/tags?post=9066"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Care Tips<\/h3>\n
Keep your onions in a bright spot with at least 6 hours of sunlight daily, like a sunny windowsill or balcony. Water soil when the top inch feels dry\u2014don’t overwater to avoid rot. If growing in water, monitor water levels, add fresh water as needed, and keep it clean.<\/p>\n
With a little patience and regular care, your onions will grow new shoots, and in time, you might enjoy fresh green tops or whole onions right from your home garden.<\/p>\n
Caring for Your Growing Onion Plant<\/h2>\n
Caring for your growing onion plant is all about consistency and attention to its changing needs. Onions love sunlight, so pick a spot that gets at least six hours of direct sun each day\u2014windowsills work well for indoor plants, while outdoor beds or containers should be placed in a sunny area.<\/p>\n
Water onions regularly but avoid overwatering, as soggy soil can lead to rot. Aim to keep the soil evenly moist, allowing the top inch to dry out before watering again. Fertilize every two to three weeks with a low-nitrogen fertilizer to encourage bulb development, but always follow package instructions to prevent burning the plants.<\/p>\n
Healthy onions grow upright with firm, green leaves. Yellowing, wilting, or drooping can indicate overwatering, nutrient deficiencies, or fungal issues, so check your plant\u2019s environment if you notice these signs.<\/p>\n
Indoor Onion Growing<\/h3>\n
For indoor onion growing, use a pot that\u2019s at least six inches deep and has good drainage. Make sure the room temperature stays between 60\u201375\u00b0F for optimal growth.<\/p>\n
Outdoor Onion Growing<\/h3>\n
Outdoors, choose a well-draining bed and watch for pests like onion maggots or thrips. Using yellow sticky traps and performing regular inspections will help catch problems early.<\/p>\n
Transplanting Onions Outdoors<\/h4>\n
When starting onions indoors, transplant them outdoors after the last frost, when seedlings have three to four leaves and are about six inches tall. Gently harden off your plants by setting them outside for a few hours each day over the course of a week. Then, transplant them into prepared soil at least four inches apart, being careful not to damage delicate roots.<\/p>\n
With these steps, you\u2019ll set your onions up for a healthy growing season, whether inside or out.<\/p>\n
Harvesting and Using Your Homegrown Onions<\/h2>\n
Knowing when to harvest your homegrown onions is key to enjoying the freshest flavors. For onion greens, start snipping when the shoots are 6-8 inches tall\u2014think of them as scallions for salads, omelets, or garnishes. To harvest, use sharp scissors to cut the greens an inch above the bulb, allowing them to regrow for several rounds.<\/p>\n
Full onion bulbs are ready when the tops begin to yellow and naturally tip over; leave them in the soil for another week to help the bulbs mature. Harvest on a dry day by gently loosening the soil with a fork and lifting the bulbs out by hand, brushing off excess dirt but avoiding damage to their skins.<\/p>\n
After curing in a warm, airy spot for two weeks, your onions are kitchen-ready. Fresh onions add amazing depth to salsas, soups, stir-fries, and salads\u2014try slicing just-harvested bulbs into sandwiches or roasting them whole with olive oil for a sweet, caramelized treat.<\/p>\n
Regrowing Onions from Scraps<\/h3>\n
For an endless supply, don\u2019t toss those onion scraps! Place the root end of your onion\u2014about an inch and a half long\u2014in a cup with just enough water to cover the roots. Set it on a sunny windowsill, changing the water every few days.<\/p>\n
In a week or two, you\u2019ll see new greens sprout, and you can plant the regrown root back into soil to foster a whole new bulb. This simple practice recycles kitchen waste and keeps the onion harvest going, turning each bulb into multiple meals throughout the season.<\/p>\n
Tips & Troubleshooting for Best Results<\/h2>\n
To get the most from your onion regrowth efforts, start by placing your onion scraps or bulbs in a clean jar or shallow dish with just enough water to cover the roots. Change the water every two to three days to prevent rot and bacteria buildup.<\/p>\n
Position your jar in a bright, sunny spot, such as a windowsill, and rotate it every few days so each side gets equal access to sunlight. This helps your onions grow straight and strong. Avoid overcrowding the container; give each bulb or scrap a little space so the roots and shoots don’t compete for nutrients and air, which can slow growth.<\/p>\n
One common challenge is slow sprouting, often caused by low light, cold drafts, or using old scraps. Try moving the jar to a sunnier, consistently warm location, and always use firm, healthy onion pieces for the best results.<\/p>\n
If your onions start to bolt and send up flower stalks, cut these off at the base to redirect energy back to leaf and root production. Flowering usually means the onion is stressed, often from extreme temperature changes, so aim for stable room temperatures and consistent care.<\/p>\n
Pests like gnats or mold can also appear in standing water. Combat this by rinsing the bulbs and changing the water more frequently, or consider transferring them to soil sooner for added protection.<\/p>\n
The best time of year to start onions from scraps is early spring, when natural daylight increases and temperatures rise. However, indoor cultures can work year-round if you provide supplemental lighting and warmth.<\/p>\n
With these simple tips and some patience, you can enjoy an endless cycle of fresh green onion growth right on your kitchen windowsill.<\/p>\n
Frequently Asked Questions (FAQs) about Regrowing Onions<\/h2>\n
Regrowing onions is a simple and rewarding project, but it\u2019s good to know what to expect before you start. If you\u2019re regrowing green onions (also called scallions), you can snip the tops and place the white roots in a glass of water\u2014a fresh batch of tasty green shoots will appear in as little as a week!<\/p>\n
For bulb onions, the process takes longer and results may vary. If you plant the bottom root section of a bulb onion in soil, you\u2019ll often get green onion shoots rather than a new full-sized bulb. While it\u2019s possible to eventually grow new bulbs, it can take several months, and success depends on factors such as variety, climate, and whether the onion was previously treated to prevent sprouting.<\/p>\n
Alternatively, planting a whole sprouted onion in the ground can give you a better chance of producing new bulbs. As it grows, the sprouted onion sometimes splits, forming several small bulbs called \u201csets,\u201d which you can harvest or replant.<\/p>\n
Keep in mind, regrowing onions is more reliable if you use sets or seeds from the garden center, especially if you\u2019re hoping for full-sized bulbs.<\/p>\n
For more detailed onion regrowing guides and troubleshooting tips, check out trusted gardening sites like The Old Farmer\u2019s Almanac<\/em> or local extension service websites. Don\u2019t be afraid to experiment\u2014each attempt helps you learn more about your plants and your garden\u2019s conditions.<\/p>\n","protected":false},"excerpt":{"rendered":" Introduction Did you know you can regrow store-bought onions right on your kitchen counter or windowsill with very little effort? Whether you want to cut down on food waste or save a few extra dollars at the grocery store, learning how to regrow onions from kitchen scraps or sprouted bulbs is an easy and surprisingly … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":9065,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-9066","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-onion"],"_links":{"self":[{"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/posts\/9066","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/comments?post=9066"}],"version-history":[{"count":3,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/posts\/9066\/revisions"}],"predecessor-version":[{"id":15831,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/posts\/9066\/revisions\/15831"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/media\/9065"}],"wp:attachment":[{"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/media?parent=9066"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/categories?post=9066"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cultivatedearth.com\/en\/wp-json\/wp\/v2\/tags?post=9066"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}