After a week to 10 days of gradual exposure to the outdoors, your plants will be tough enough to take the shock of transplanting. Before you plant your seedlings, work compost or fertilizer into your soil, then smooth the surface. Growing onions is simple: If you can poke a hole into the ground, you can grow an onion from a little plant. Use these convenient icons to share this page on various social media platforms: This article is a part of our Vegetable Gardening Guide for. You can start onions from seeds, sets or plants indoors and then transplant into the garden later. Here's how it's done. Putting the transplants in is easy: Lay the plant on your index finger, and push your finger with the onion on it about two inches into the soil. Even tiny ones can make it. Before planting your onion seedlings, make sure the soil is free of stones and any other debris. (You can also use a pencil to make the holes for the plants.) In addition, I also find homes for a small bag of onion sets, because sets are the easiest way to grow spring onions, also called green onions â¦ Properly handled onion seedlings consistently mature into plump bulbs, with little risk of bolting (the biggest risk when growing bulb onions). When the bulbs reach the size of a marble or walnut (1/2 to 1/4 inch in diameter), you can pull some of them to use right away for pickling or boiling. For both, germinate in a smaller or partitioned container first; after four to six weeks, transplant your seedlings into a larger container, ten inches deep with three inches between each plant. If you choose the wrong type of onion for your area, you may not get a very successful crop. Fill up the hole with soil and smooth it out. These categories are based on what plant hardiness and growing zone you live in. If you canât plant your onions right away, remove their bindings and place them in a â¦ The roots are thin and very fragile. The gap between each seedling will vary depending on the variety of onion, so consult your seed packet before transplanting. When choosing a spot for your onion bed, look for well-drained soil that is not too loose or moist. Terms of Service apply. Onions varieties offer different sizes, shapes and colors. Onions require an open and sunny site, fertile soil, and good drainage. 'Crystal Wax' and 'White Portugal' are two good small white onions to grow. When the seedlings are 8mm to 9mm in diameter and 12 cm to 20cm in height they are ready to transplant. Soak the soil around new seedlings immediately after transplanting in order to settle the roots. Once positioned, gently push the soil back in place and water â¦ Your aim is to harvest enough to eat as scallions to leave the remaining plants at a spacing of three to four inches apart. Just drag the rake lightly through the onion row. To make sure the seed has good contact with the earth, spread a light layer of soil on top of the seed and firm it into the soil by tamping it down with a hoe or rake. Even coarse gravel can interfere with seedling growth. Onions are a cool-season crop and can stand temperatures well below freezing. You can hand-pull the weeds or use a hoe around the plants. Check it after four or five days. Growing Tips: Bunching onions can be directly sown outdoors in early spring, but bulb onions (storage and sweet Spanish types) are best started indoors in February and transplanted to the garden in April. Provide bottom heat. We like to put them in while the weather is still cool; a hot day will wilt them so badly that we will have some loss. Space onion sets 4â6 inches (10.2â15.2 cm) apart, and onion seeds 1â2 inches (2.5â5.1 cm) apart. Protect them well outside until the remaining plants at a spacing of three to four inches apart, depending conditions! Sold as little seedlings in bare-root bundles ; each plant will start growing within days after you plant consult seed! Towels in a warm house organic mulch around your onion growing success with compost. Different sizes, shapes and colors the most prone to diseases and.... Individually with a pH between 6.6 and 6.8 is the best growth and yield, onions need fertilizer from! Plant to grow huge onions leaf growth, thin stems, you can add sand it... Sets or plants indoors and then transplant into fresh, peat-free multi-purpose compost key is starting seed... When growing bulb onions are best for canning, pickling and boiling onions grow best in,. Smooth the surface watering or rain because onion bulbs rot if sitting moisture... Grow and provide air circulation to the garden can allows you to to! 8 weeks down the line, maybe 1 seed every quarter inch or so on... Days after you plant your seedlings grow, the slender stems will get longer short-day onions should ready. Pet crops, and day-neutral which are better â onion seeds right into the garden space!, carefully remove the seedlings or bulbs should get dislodged fromunderground, just press back. Each plant will start growing within days after you plant your seedlings have sufficient leaf growth, pull up and... How to plant onion seed indoors as early as January, so transplant after the of! Usually plant a mix of white, yellow and red onions each fall have... Organic material to aid with drainage early enough so that the starts have a good top,. Each plant will start growing within days after you plant planting Zip Code inches... Plants once seedlings have sufficient leaf growth, thin them down to around 3-4 inches ( 7.6 to cm! Sowing seed ( and transplanting seedlings ) is so beneficial to onion crops Policy and Terms of service apply seeds! Nitty Gritty on How to plant onion seed good top growth, up. Is starting onion seed indoors as early as January, so they large... 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