![]() Now that you know all the steps, supplies, and tips on growing onions from seed, you’ll be able to enjoy any type you like, and tackle it with confidence. To direct sow, plant them 1-2 weeks before the last frost. In cold areas, start them indoors 10-12 weeks before your average last frost date. The ideal month to plant onion seeds varies based on where you live. Yes, you can direct sow onion seeds in early spring, or as soon as the soil is workable if you live in a cold climate, or in the fall in warmer areas. Onions are not hard to grow from seed once you understand their light, water, and temperature needs. Onion seeds don’t need light to germinate, but the seedlings will require 12 hours a day as soon as they begin to emerge. They’re small and may not germinate if they’re too far down. Newer seeds have higher germination rates, so you can use less if you want. You should plant 4-8 onion seeds per hole for the best results. How many onion seeds do you plant per hole? If yours isn’t on the list, please add it to the comments section below. Here I’ve answered some of the most commonly asked questions about growing onions from seed. Transplanting onion seedlings into the garden FAQs They transplant very well, so you could use either plastic or plantable pots for them. When seedlings have at least three leaves each indoors, pot them up into larger containers to encourage stronger root development. Though you can plant onion seeds in clusters, it’s best to thin them so there’s only one plant every 4-6” in the garden, or one per cell or pellet indoors. You can also use an oscillating fan set on low nearby to simulate wind and strengthen them. Air CirculationĪs soon as they have sprouted, remove the plastic to encourage air flow around them. Compost tea or fish emulsion are also two great options. FertilizerĪfter three weeks you can begin using a half-strength organic fertilizer once a week. Use a moisture meter to help you get it just right. They need to be kept evenly moist at all times, but never in water-logged or soggy soil. To avoid legginess, I recommend using a grow light set 1” above the tops. It’s hard to achieve this indoors, even with a sunny window. Once sprouted, onion seedlings will need 12 hours of light a day. If you encounter any issues, read my guide on how to fix common problems here. Give them the best light, water, and occasional pinching to encourage strong roots. Properly caring for onion seedlings makes all the difference. ![]() Choose Granex Yellow, Red Burgundy, Red Creole, Southern Belle, White Bermuda, or Texas Supersweet.īaby onion seedling germinating How To Care For Indoor Onion Seedlings
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