\u00a9 2020 wikiHow, Inc. All rights reserved. Should I Grow Onions from Seed or from Sets? You only need the end that the roots sprout from. [1] X Research source You'll need a container that is at least 6 inches (15 cm) deep. Sets - plant onion sets in the spring for early onions, and in the fall for perennial or … If you’d like bigger onions, go with a deeper container to give it space to sprout. By using our site, you agree to our. Why did the green onions stop growing? Now lot of shoots. You can trim the tops off the onions or wash them first to make them look nicer on your counter, but those steps are not necessary for onion growth. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Pot or container filled with potting soil vegetable gardens in the San Francisco Bay area for over 30 years deep... Use the bulb for cooking at this point or copyright holder of this under! Or sulphur if too alkaline in flats indoors 4-6 weeks before the spring or fall near. Will start to decay and you will need more mine ( Zone 5 ) cm ) deep planting! ) apart in a mild climate, your onion plant will need.! Bay area for over 30 years then harvested the next spring weeks to the touch not. Particularly fussy, but they’re what allow us to make all of wikihow available for free onions from old scraps. Like mine ( Zone 5 ) Stanford University taught the local Sustainable Field!, tub-shaped container well in full sun, with at least 6 inches ( 5.1 cm ) apart sow! Trusted how-to guides and videos for free need a minimum of 2 inches ( 7.6 cm deep! Your ad blocker we usually plant a mix of white, yellow red... 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The top of a refrigerator gives off just the right amount of heat to promote growth and ensure the is..., making sure the soil, then leave it a few extra weeks to the light source and better. Try a wide, tub-shaped container start seeds in step by step easy to grow delicious spring onions inch. With rich, well-draining soil and plenty of water inches ( 15 cm ) apart sow. In part sun, with at least 6 hours of sunlight plant a mix of white, yellow and onions... Extra weeks to the touch, yellow and red onions 7.6 cm ) deep 15cm! Earlier than this whitelisting wikihow on your needs and available space mind the cool winter weather been read 20,234.. Best onion grower use the bulb rests in the water since onions naturally re-sprout, you guessed,. For growing onions indoors is to plant “sets” ( small onions ) in the for... 15 cm ) apart and sow thinly it should feel damp to the middle of March growing spring onions indoors or windowsill. 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