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The Daily Insight

Can you grow onions indoors

Author

Andrew White

Published Mar 06, 2026

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.

Can you grow onions inside your house?

Onions are hardy plants and easy to grow inside. Green onions, or scallions, are popular with indoor and casual gardeners because of how easily they grow. Bulb onions require a little more space than scallions but can be grown in pots, containers, and even plastic water bottles.

Can I grow onions in pots?

The way to grow onions in container gardens is much like growing onions in the ground. You need good soil, adequate drainage, good fertilizer, and plenty of light. … If you choose to grow onions in pots, choose a large mouthed pot. It needs to be at least 10 inches (25 cm.)

Can we grow onion without sunlight?

Caring for Onions Whether you are growing green onions from seed, transplants or dormant bulbs called sets, be sure to select a place in your garden where they can thrive. Onions need full sun and fertile, well-drained soil with a pH between 6.2 and 6.8, advises Cornell University.

Can you grow onions all year round?

All onion varieties are easy to grow and they store well, too, so you can enjoy home-grown onions all year round.

Can you grow onions in an apartment?

It’s easy to grow them indoors in decorative pots or water dishes because they don’t require much space and don’t need direct sunlight. Since onions naturally re-sprout, you can grow new onions from old onion scraps or you can grow them from seeds.

Can I grow an onion from an onion?

In short the answer is, YES! You can plant a sprouted onion and grow a new one. Actually usually you’ll get three new onions from one sprouted onion!

What happens if I plant an onion?

The onion might get a little mushy after it sprouts, but it’s not poisonous or toxic and it won’t hurt you. Especially if the roots and shoots are still small, it’s still perfectly good. Lots of people intentionally eat the sprouts since they have more protein (so they’re popular with vegetarians and vegans).

Do onions like shade?

Onions need full sun. Select a location where your onions won’t be shaded by other plants. Onions need well-drained, loose and nitrogen-rich soil. Till or turn your garden soil as soon as it is workable in the spring.

How many onions will one onion grow?

One onion grows per onion plant. There is one variety of onion known as the potato onion, or multiplier onion, that grows around 5 onions per plant. The potato onion is classified scientifically as Allium cepa var. aggregatum, and is more closely related to the shallot or garlic than most onions.

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How do you grow onions in a 5 gallon bucket?

The best time to plant them is 2 to 4 weeks before the last frost date. Fill your bucket with soil bury the sets no more than an inch deep. In a 5-gallon bucket, the onions will need about 3 inches of space between them. So, plant out your arrangement to plant the most sets you can in a single bucket.

How much depth do onions need to grow?

Sets should be planted at a depth of 1 to 1 1/2 inches in rows 12 to 15 inches apart. For dry onions, plant the sets 2 to 3 inches apart.

How do you grow sprouted onions indoors?

Planting the Sprouted Onions. Plant the sprouts 1 inch (2.5 cm) deep in quality potting soil. Dig an individual hole for each sprout, and cover it so only the green part sticks out. Keep each sprout at least 3 inches apart (7.5 cm), or in separate pots, so they don’t need to compete for space.

What is the best month to plant onions?

Onions like cool weather in the early part of their growth, so plant them in spring — except in mild-winter areas, where onions are grown as a fall or winter crop. Generally speaking, onions grow tops in cool weather and form bulbs when the weather warms.

Can you grow yellow onions indoors?

Starting Indoors can grow well in a cup of water, yellow onions need soil to develop their roots and bulbs properly. Keep about 1 or 2 inches of the onion flesh attached to the root end of the onion. Place this scrap piece in a shallow bowl and allow the roots to soak for a day to soften them.

What seasons do onions grow?

What is the best time of year to plant onions? As far as temperatures go, onions (Allium cepa) are a hardy plant that can grow almost any time of year. Most folks plant them either in early spring for an early summer harvest, or many plant seeds in late summer or early fall for an overwintered spring harvest.

How long does it take to regrow onions?

Growing fresh green shoots from an onion’s base is how many people reuse their onion scraps. But either on a window sill or in an outdoor onion patch, one can regrow a scrap into a full-sized onion using the method above. All that is needed is time and patience because the cycle can take 90 to 120 days.

How do you know when onions are ready to harvest?

There is no perfect size, just pull when they are big enough to suit you. For full-sized bulbs, let onions grow and mature. They are ready to harvest when the bulbs are big and the tops begin to turn yellow and fall over. Pull them up, shake off the soil, and lay them out to cure with the tops still attached.

What are good companion plants for onions?

  • Cabbage. Onions will generally work best with Brassicas, members of the cabbage family. …
  • Chamomile. …
  • Summer savory. …
  • Carrots. …
  • Leeks. …
  • Beets. …
  • Lettuce. …
  • Strawberries.

Do onions need a lot of water?

Onion plants require adequate water to produce high yields, but it doesn’t take much over watering for your onions to become diseased and rot in the ground. … In a typical 12 week growing season, we recommend irrigating with one inch of water once or twice a week depending on the amount of rainfall received.

Can you eat sprouted onions?

The sprouts will also grow if the garlic or onion isn’t stored properly. … For onions, the sprout grows through the center of the bulb. The good news is the sprouts are safe to eat. They do have a tendency to taste a bit bitter, however.

Are onion stalks poisonous?

If you find an onion with the long greens still attached (mostly in spring), don’t throw those greens away! They have a lovely mild onion flavor and you can use them just as you would use a scallion.

Can you plant a sprouting potato?

Yep! You can plant a sprouted potato in order to grow more potatoes. You will actually get several potato plants and ultimately a bunch of new potatoes from just one sprouted potato if you do it right. … You can plant any kind of sprouted potato from sweet potatoes to yellow or white potatoes.

Do onions grow flowers?

Don’t let onions flower! … As soon as you see an onion has flower buds, snip the buds to prevent the bulb from splitting, then harvest and eat those onions first, the sooner the better. Onions that have bolted don’t store well. Onion bolting is a problem for even professional growers.

Can onions grow in shallow soil?

Although grown mostly for their roots, onions are shallow-rooted crops that need good drainage. Planters can allow for better drainage than in-ground planting, particularly if you have clay soil.