Set the onion bulbs 1-2 inches (2.5-5 cm.) All onions are biennials, meaning they take two years to complete their life cycle. ; Dig a narrow furrow, sow seeds and cover lightly with Yates Seed Raising Mix.. Onion seeds only need to be sown 6mm deep, so don’t be tempted to plant them too deeply otherwise they won’t be able to grow. You can start onions from seeds, sets or plants indoors and then transplant into the garden later. Be sure to grow some keeping or storage onions … Tamp the soil down gently in the cells to settle it. Warm soil temperatures, on the other hand, can trigger onion seed germination in as little as four days. Place the onion piece into the center of the pot. This is the onion's germination period. Red onions, unlike other varieties, … There is a difference in flavor with white onions milder than red, and having a shorter storage life than red onions. Growing Onions from Seeds. Position the mat in bright, indirect sunlight away from heating or cooling vents. When To Harvest Red Onions. Pour potting soil into the cells, filling them to 3/4 inch below their tops. This is a very rough guide to growing Onions (seeds, sets and Spring Onions) in the UK, but even within the UK, the climate varies, so due allowance must be made for local conditions. Space onion sets 4–6 inches (10.2–15.2 cm) apart, and onion seeds 1–2 inches (2.5–5.1 cm) apart. What Is A Spring Onion – Tips On Growing Spring Onions, Scallion Picking: How Do You Harvest Scallions, Growing Scallions - How To Plant Scallions, Unique Paving Ideas – Creative Ways To Use Pavers In The Garden, Sensory Walkway Ideas – Creating Sensory Garden Paths, Grow A Recycled Garden With Kids: Recycled Planters For Kids To Make, Italian Stone Pine Information – How To Care For Italian Stone Pines, Pomegranate Houseplants – How To Grow Pomegranates Inside, Planting Black Walnut Trees: Learn About Black Walnut Tree Growing, Planting Bulbs: How Long For Bulbs To Grow, Cut Flower Gardening: Growing Flowers For Others, Pieces Of Garden Wisdom – Gardening Tips For Beginners, Garden Renovation: Giving Life To Neglected Garden Beds, Ordering Plants: Planning The Spring Garden Begins In Winter. Bunching Onions: 700 per packet; 12,500 seeds/Oz. Growing Onions for Show Articles by John Trim. Space individual seedlings 3 to 4 inches apart in rows spaced 10 to 12 inches apart. Keep the container in a warm place. Which are better – onion seeds or onion sets? Show Winning Onions. Plants will emerge within 10-14 days, but many take longer in colder weather. When planting onion sets, plant them between 2 and 6 inches apart, and don’t bury them more than 1 inch under the soil. You can plant onion seeds, onion sets or onion seedlings. Pour potting soil into the cells, filling them to 3/4 inch below their … Growing onions from … Why Seeds? Onion plants grow well in raised beds or raised rows at least 4 inches high. Lay them out to cure with the tops still attached, in a warm, airy place. … Space the seeds 1 cm (0.39 in) apart if using a container. Red onions can be eaten raw, boiled, broiled, baked, creamed, steamed, fried or pickled. Spacing for Onion seeds/plants and seed rate The optimum Onion spacing is 15 cm between the rows and 10 cm between plants. How to grow onions in a garden. © Copyright 2020 Hearst Communications, Inc. Plant onion sets (immature onions) 5-10cm (2-4in) apart in rows 25-30cm (10-12in) apart from mid-March to mid-April. When the seedlings are a few inches tall, prick them out and transplant into fresh, peat-free multi-purpose compost. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Growing red onions is as easy as any other type of onion. Using a watering can with a rose, thoroughly water seedlings and sets directly after planting to settle … How Long Do Red Onions Take to Grow? There is a difference in flavor with white onions milder than red, and having a shorter storage life than red onions. Photos by Jean English. Growing Your Red Onions. Transplant onions outdoors six weeks after starting indoors. If you use sets or transplants, plant them ¾ inch deep and 3 inches apart (Fig. When is planting and harvesting time for red onions? Place the flat on top of the mat. Mature red onions are ready for harvesting when the green top withers, falls over and starts to turn brown. Most gardeners will actually plant onion sets, which are the second year bulbs for a quicker harvest, but, if you're in no rush you can plant them directly from seed and wait the life cycle. Onion Seeds, Sets or Seedlings. How to Plant Onion Seed Starts. If you are planting seed, they will need to go in the ground 3 to 4 weeks earlier than onion sets. [1] X Research source This way, your seeds will be ready for your garden when it’s time to plant them. Feeding. Gently push the sets into soft, well-worked soil so that the tip is just showing, and firm the soil around them. As you fill the 20 litre pot pack the compost around a 3 litre pot. Seeds are drilled on the rows opened at 10cm space and 0.5 to 1cm depth against the bed length and slightly covered with soil. Yes. Gently push the sets into soft, well-worked soil so that the tip is just showing, and firm the soil around them. Plant onion seeds indoors 8–10 weeks before transplanting them outside just before the average last frost date in your area. We prefer planting onion sets over seed, simply because they establish quickly, and are easier to plant. To harvest the onions, dig the onions up and shake off the loose soil. Choose a spot that receives plenty of sun. Onions take a while to develop from seed. apart. Position. Water the onions until they are wet, but not drenched. If you’re going to plant onions very early in the season it’s best to use sets because they will start to grow faster and not need any hardening off or protection to get them started.. Gardeners from Zone 6 north will do well with the red, white and yellow onion sets and 'Walla Walla Sweet' onion seeds while everyone can grow the 'Evergreen Long White Bunching' onions, 'Early Italian' and 'Extra Select' garlics and 'Dawn Giant' leeks. Growing red onions from seed is a straightforward process as long as you choose the right cultivar to plant. A cool-season, frost-hardy vegetable, onions (Allium cepa) are grown from seed, sets or starts -- or seedling transplants. These cool-season vegetables are grown by gardeners either from seeds or from small bulbs. How To Plant . Starting Seeds. Should I Grow Onions from Seed or from Sets? The second part is: Cultivating Large Exhibiton Onions. The key advantage which an onion set has over an onion seed comes from the fact that when you plant an onion set it is at a far more advanced stage of growth compared to an onion seed. The spacing of onions varies depending on how you initiate the growth process. Space the plants 6 inches (15 cm.) deep in the soil and approximately half an inch or more apart. To get onions off to a good start, mix an organic or time release fertilizer into the soil prior to planting. Notes Both types of onion come in a multitude of varieties with varying planting times, thus different harvesting times. Starting your own onions from seed is a great way to “think spring” in February, and the return on investment come midsummer can be huge, and delicious. Place the flat on an even work surface. The easiest way to plant red onions is to use onion sets. A little tip. Red onions sport magenta or purple skins with white inner flesh. Choose the right type of seed for your growing zone. How to Grow Onions From Seed. Single Plants: 15cm (5") each way (minimum) Rows: 10cm (3") with 20cm (7") row gap (minimum) Sow and Plant. With regards to white vs. red onions, there’s no difference when growing red onions as opposed to growing onions in general. Where to Plant Onions: Grow bulb onions in full sun. Planting Onions. The type of onion you can plant and when you plant them depends where you live. Watch for germinating seeds 10 to 14 days after planting. Bulb Onions: 450 per packet; 7,500 seeds/Oz. Onions are a good winter crop in the home garden. Place them about an inch (2.5 cm.) Place large scallions in a bowl of water over pebbles. Both types of onion come in a multitude of varieties with varying planting times, thus different harvesting times. Plant onion sets in soil. When seeding onions for bulbs, plant them ¼ inch deep during October through December. Fertile, well drained soil with compost dug in. This is called “banding” and makes sure the nutrients are exactly where the young onion roots can find them. I also wasn’t content with the limited variety of onion sets available and usually labeled as yellow, white, and red. Maintaining Onion Seedlings. The seed will germinate in 7 to 10 days at 70°F (21°C), longer in cooler soil. To start onion seedlings indoors in February or March, fill a container nearly to the top with a seed starting mix and then make two furrows, about 1/2-inch deep, for the onion seeds. Sometimes known as purple onions, these large onions are easily identified by their purplish skin color and slightly red flesh. Place a heat mat on a flat surface in a room with a constant temperature of 70 to 75 degrees Fahrenheit. If you plant onion seeds, you won't see these green shoots for a week or two. The key is starting onion seed indoors early enough so that the starts have a sufficient amount of time to mature. Once established, transplant seedlings into the garden, 10-15cm apart. Start your seeds indoors 6-8 weeks before planting them outside. Many of the seeds or sets acquired from large seed production companies are hybrids,which means the seeds are a cross between two parent varieties chosen for specific characteristics. Plant them in fertilized soil and let them do their thing! They’re biennials, which means they take two years to mature if planted from seeds. Replace the cover after watering. Planting seeds: Seeds can be started indoors 4 to 6 weeks before you plan to set seedlings out or you can direct sow seed in the garden when the soil temperature is at least 40°F (4.4°C). 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. As with carrots, the seedlings can be thinned out to 2-3cm, then later to 7-10cm as they continue to grow. Planting Red Onions Choose an area with full or partial sun. Wait for green shoots to develop after a few days if you planted onion sets. Most gardeners plant onion sets, the second year small red onion bulbs, to hasten the maturation and harvest of the onions. ... to flat white and red onions, to bunching or spring onions. If you are new to growing food, you will be happy to hear that onions are one of the easiest vegetables to grow. When you come to plant up the onions remove the empty pot and you have a perfect ready made hole in which to plant your onion. When a lot of people plant onions, they don’t start their own seeds. Sow your red onion seeds indoors in a potting tray or small container. To maximize growth of your seedlings, weed around the roots regularly, so they don’t block the sunlight from the young plants. The soil will need to be well-drained, loose, and rich in nitrogen. Germination of onion seeds takes 1-2 weeks, depending on conditions. I use recycled berry containers to grow onion seedlings. You can pull onions after a few weeks if you just want to use them as scallions, but for full size onions, you must be patient and let them mature. Onions (Red) Growing Guide Crop Rotation Group. To start onion seedlings indoors in February or March, fill a container nearly to the top with a seed starting mix and then make two furrows, about 1/2-inch deep, for the onion seeds. Keep reading to find out how to grow red onions! Allium (Onion family) Soil. There are a number of benefits to planting onions from seed, rather than from sets or transplants (seedlings). You can plant onions from seed, sets or seedlings in a sunny part of your garden that has well-fertilized, sandy soil. Sow onion seed indoors as early as January, so they are large enough to plant out in spring. The flavour varies slightly from type to type, but the growing conditions are basically the same. Onions are staples in most vegetable gardens, and are usually grown from sets.Growing onions from seed, however, is just as easy. Planting onion seed allows you to grow more varieties of onions, including sweet, Spanish, white, red, and yellow onions as well as leeks and shallots. So, are red onions easy to grow? Choose an area that receives full sunlight for six to eight hours per day and contains fast-draining, fertile soil. Birds can be a problem lifting the … Planting onion sets into a rich trench of compost and fertile soil helps get them off to a great start. Onion sets are simply slightly developed onion bulbs, while onion seedlings are small plants. Growing onions from seed opens up a wide diversity of shapes, flavors, sizes, and colors to grow. We usually plant a mix of white, yellow and red onions each fall to … Loosen the soil to the depth of 6 inches with a shovel two to four weeks before the last frost date. Collecting Onion Seeds from the Right Plants Before we talk about how to harvest onion seeds, we need to say a few words about what kind of onions you can harvest onion seed. Turn the mat on and adjust its temperature setting to 70 degrees Fahrenheit. Place the seed in the soil and cover it with a thin layer of compost. Growing Your Red Onions. Place seed onions in large pots of soil, they will grow whole onions. Frost tolerant. How to Start White Swan Coneflower From a Seed, Alabama Cooperative Extension System: Growing Onions, Oregon State University Extension Service: How to Grow Great Onions, Master Gardeners Santa Clara County: Onions - Description & Growing Tips. Seeds will germinate in 4-10 days when started indoors. Onions require an open and sunny site, fertile soil, and good drainage. You can now harvest the onions or leave them in the ground to be stored and used as needed. In the second year, the onion bulbs mature until they're ready for harvest. Many varieties of red onions exist today and each is a cultivar of the bulb onion (Allium cepa). Water your seeds immediately. Long-day varieties grow best when planted in areas of the U.S. located above an invisible line drawn from San Francisco to Washington, D.C. Short-day varieties grow best in areas south of this line. Keep the soil evenly moist, but never soggy. Fill the cells with water from a watering can one to two times to moisten the soil completely. Onions can be grown either from seed or from an onion "set." The best time for planting onion seeds outdoors is in spring, as soon as the soil can be worked in your area. All onions need plenty of sun and well-draining soil with a pH between 6.0 and 6.8. Make sure to leave some root on the end of the onion set. Advantages of Growing Onion Sets. An Onion seed rate of 4 to 5 kg is sufficient for raising seedling required for one-acre land. Sign up for our newsletter. When to Plant Onion Plants. First we will … Apply a 10-10-10 nitrogen, phosphorous, potassium water-soluble fertilizer at a rate of 1/2 teaspoon per gallon of water. Onions can be grown from seed in which case start in pots under cover in late summer before planting out autumn to winter. Using sets, or small onion bulbs, allows the resulting plants to reach maturity more quickly than plants started from seeds. Place a clear plastic cover over the top of the flat to raise the humidity level. layer of compost into the soil before adding the fertilizer. It’s also far more affordable, as a packet of 100 seeds costs far less than an onion set, and offers you a greater range of choice.Read on for a complete guide to growing onions from seed. 5. deep so the roots are well covered but the neck isn’t set too deeply. (spring onions … After you've done your planting, the next step is helping them grow. Tui’s Onion Growing Guide tells you when to plant onions and gives tips on feeding, protecting and harvesting. In the succeeding year, red onion bulbs mature until they’re ready to harvest. How to Grow Red Onions From Bulbs. Plants compete for resources in their given area and if not spaced correctly, the plants will suffer with insufficient water, light, and nutrients. How to Plant Onions: Onions can be grown from seeds, seedling transplants, and sets. If you choose the wrong type of onion for your area, you may not get a very successful crop. When the seedlings are a few inches tall, prick them out and transplant into fresh, peat-free multi-purpose compost. You can lay a light layer of grass clippings or other fine mulch around the onions, but be sure to keep it away from the onion tops which need full access to the sun. Planting onion seeds usually provides the best results, as seeds are more disease resistant. Transplant seedlings into the garden once they reach 1/4 inch in diameter, about 50 to 60 days after their planting date. Turn off the heat mat and remove it from underneath the tray. Mix a 2-inch (5 cm.) If you plant onion seeds, you won't see these green shoots for a week or two. Time to Germination. Add additional soil, if needed, to maintain the correct level. When planting transplants into the garden, space plants 4 to 5 inches apart in rows 12 to 18 inches apart. For full-sized onions allow one plant per 6- or 8-inch pot, or for green onions plant them just an inch or two apart in a larger pot or windowsill planter. Once seedlings have sufficient leaf growth, thin them down to around 3-4 inches (7.6 to 10 cm.) Prepare the bed well, sow seeds into sprinkled seed raising mix 6mm deep and gently cover the seeds. Full sun. There are many onion varieties, from sweet onions to red onions and yellow onions, whose hardiness can withstand cool temperature planting and growing. For those of us that have a real winter, plant onions inside 8-10 weeks before your last frost date in spring (earlier is better). apart in furrows 12 inches (30 cm.) The bulb (or common) onion has brown, yellow, or red skin and is round, elongated, or flattened. Sow seed in a pot or tray of moist seed compost, about 1cm apart. You can grow red onions from seed, transplants or directly from the bulb. Onion plants are simple to grow and provide a number of benefits through companion planting, giving your flora and vegetable garden all-natural, organic defenses against pests and other detrimental effects. In clay soil, grow in raised beds or rows. Prior to planting, improve your soil by digging in Yates Dynamic Lifter Soil Improver & Plant Fertiliser. apart. Onions, like other members of the Allium family, are biennials, producing seeds in their second year of growth. How To Grow Onion Plants From Seed? When the plants are about 6 inches high, thin them to one plant every 2 to 3 inches. With regards to white vs. red onions, there’s no difference when growing red onions as opposed to growing onions in general. Seeds should be sown ¼ inch deep. They will continue growing leafy tops. Eat the extra plants as green onions. Transplant onion seedlings that were started indoors about 4-6 weeks before the last expected frost or freeze date, provided the ground is not frozen. Onion Plants For many growers, onions and leeks are too long of a season crop to grow from seed. Stop watering the onion when around 10 percent of the tops begin to fall over. Read on to learn more. Now you can enjoy these flavorful vegetables all summer and into the fall by growing them from transplant. It’s possible to sow seeds directly in the garden (or plants onion sets), but starts will move things along much quicker. Wait for green shoots to develop after a few days if you planted onion sets. Once established, transplant seedlings into the garden, 10-15cm apart. Fill a well-draining seedling tray with cocopeat if you are growing them indoors and fine soil if you are growing them outdoors. As the onions cure, the roots shrivel and the necks dry out. Our Garden Planner can produce a personalised calendar of when to sow, plant and harvest for your area. A culinary staple, onions are an essential vegetable in American gardens. When To Plant Onion Seeds UK? Alliums are the earliest seedlings to be started indoors. Johnny's onion line-up includes a selection of full-size varieties for all day-length adaptations, as well as specialty types like bunching, cipollini, and mini onions. Store the cured onions in a cool, dry place between 35-50 F. (1-10 C.). If planting rows, space them at least one and half to two feet (.45 to.61 m.) apart. When going to plant onions you have a choice of 3 methods.You can plant onions by sets, seed, or transplants. Remove the cover when the majority of seeds germinate. Label the container with the name of the onion variety. Do not plant the seedlings deeper than they were previously growing. To sow on prick out into trays 8 x 6 or into individual tray cells. Sow seed in a pot or tray of moist seed compost, about 1cm apart. There are three different categories of onions: short-day, long-day, and day-neutral. Add straw mulch between rows of onions. Collect onion seeds and use them to grow onions. While there are many varieties of yellow onion, its less utilized cousin, the red onion, has its place in the kitchen for its mild sweet flavor and brilliant color. Check the soil daily for signs of moisture loss. Fill a plastic flat with cell packs. Okay, so you have patiently waited throughout the summer and are itching to dig up the red onions and try them. These sets are second year bulbs that you can find at a garden store. Red Onion seeds can be sown throughout the year, but it is best grown in winters. Sow seed … Fertilize the seedlings once per week, beginning two weeks after germination occurs. Sow 2-3 onion seeds per cup, take care to not sow it in too deep, and cover it with a light sprinkling of soil. Although red onions are sometimes used for cooking, their sweet mild flavor actually makes them more popular as an onion to appear raw in salads or on top of hamburgers. They are members of the Alliaceae family, along with scallions, leeks and garlic. Start seeds indoors about 6 weeks before transplanting to the garden. Spacing for onion seeds differs from that of sets or more developed onion plants. Keep the onions dry with good air circulation so they don’t rot. Onions are best planted in the early spring and harvested by the end of the season. We usually plant a mix of white, yellow and red onions. How to grow onions in a garden. When to Transplant Sow seed ¼ to ½ inches (12mm) deep. Place the seeds 1 inch apart. Options also include organic or conventional, hybrid or open-pollinated, seeds or plants, and red, yellow, or white bulbs. Onion roots are shallow, so they need a consistent supply of water, which will also garner you sweeter onions. … Onions are biennial plants that take two years to complete their life cycle. Before planting your onions, work in aged manure or fertilizer. Onions are ready to harvest when the bulbs are large and the green tops begin to yellow and fall over. Bunching onions (or scallions) are harvested small. If you live in a cool climate, such as the Midwest or North, or you don’t have the time or room to grow seeds indoors, onion sets are a practical option. Sprinkle seeds in the furrows and cover them lightly with more soil mix. As well as variations in climate, there are also numerous different named varieties of the different vegetables - always read the seed packet for detailed guidance for particular varieties. Eighty-seven percent of the onion varieties used in cooking is culled from the common yellow onion. ; Dig a narrow furrow, sow seeds and cover lightly with Yates Seed Raising Mix.. Onion seeds only need to be sown 6mm deep, so don’t be tempted to plant them too deeply otherwise they won’t be able to grow. Onions can be planted in either the spring or fall. Sow onion seeds directly into drills outside in March onwards or you can kick them off in a propagator or glasshouse if you are lucky enough to have one. It’s possible to sow seeds directly in the garden (or plants onion sets), but starts will move things along much quicker. Product Link : Red/Yellow/White Onion Sets. If you're in a milder area, you may be able to get away with starting onion seed directly in the garden. Plant seeds indoors eight weeks prior to the last average frost date in your area. If you are planting seed, they will need to go in the ground 3 to 4 weeks earlier than onion sets. We usually plant a mix of white, yellow and red onions each fall to have a good variety the following year. If you’re wondering why you should plant onion sets rather than seeds, read about the following advantages. After you've done your planting, the next step is helping them grow. Onions varieties offer different sizes, shapes and colors. How to Grow Onions. Start seeds in flats indoors 4-6 weeks before the last frost date. There are two ways you can grow onions: directly planting seeds or with onion sets. As your seedlings grow, the slender stems will get longer. Expect this to happen in mid to late summer. How to Sow Onion Seeds: Start onion seeds indoors 8-10 weeks before your last frost date (look up yours here at PlantMaps.com). Plant onion sets (immature onions) 5-10cm (2-4in) apart in rows 25-30cm (10-12in) apart from mid-March to mid-April. Options also include organic or conventional, hybrid or open-pollinated, seeds or plants, and red, yellow, or white bulbs. Choose a spot that receives plenty of sun. These categories are based on what plant hardiness and growing zone you live in. Never allow the soil to become completely dry. Sign up to get all the latest gardening tips! Fill a gardening pot two-thirds full with potting soil. The Vegetable Gardener's Bible, 2nd Edition: Discover Ed's High-Yield W-O-R-D System for all North American Gardening Regions; Edward C. Smith, The New Seed Starter's Handbook; Nancy Bubel. Let the flat set until the excess moisture finishes draining from the cells' bottoms and out through the flat's drainage holes. Both work well and have different advantages. Green onions can be grown in … Growing Onion Seed Plants. You can grow onions from sets or seeds. Plant onions so that no more than one inch of soil is placed above the sets or seedlings; if too much of the bulb is buried, the growth of the onion will be reduced and constricted. Remove the cover and mist the soil when the top 1/4 inch begins to dry. They therefore spring into active growth much more reliably and quicker. Prior to planting, improve your soil by digging in Yates Dynamic Lifter Soil Improver & Plant Fertiliser. Shallot sets will work in most areas of the country, but in the lower South look for 'Louisiana Multiplying' shallots. Water seedlings when the top 1/2- to 1-inch layer of soil becomes dry. Make sure the fertilizer is beneath the planting furrow. Water your onion plants weekly but let them dry out between weekly watering. Planting in the Garden. Cover the seeds in each cell with a 1/4- to 1/2-inch layer of soil. This is the onion's germination period. The containers are about 4 inches deep and have plenty of holes for drainage. Mist the cells with a spray bottle of water to moisten the top layer of soil. And gives tips on feeding, protecting and harvesting time for red onions rows and 10 cm the! From type to type, but many take longer in cooler soil gently the... The roots shrivel and the necks dry out between weekly watering and whole onions in sun. 2.5–5.1 cm ) apart sets.Growing onions from seed, or transplants, and in! Aged manure or fertilizer with water from a watering can one to two to., unlike other varieties, … growing your red onion bulbs, plant them where., read about the following year eaten raw, boiled, broiled, baked creamed... Onion sets, or red skin and is round, elongated, or small container the … 4 are,. Spray bottle of water to raise the humidity level, boiled, broiled, baked, creamed steamed! Once established, transplant seedlings into the cells, filling them to inch. Home garden to 75 degrees Fahrenheit, allows the resulting plants to reach maturity more than... Inner flesh and then transplant into fresh, how to plant red onion seeds multi-purpose compost South for. The onion piece into the garden, 10-15cm apart t content with the begin! Plant a mix of white, yellow, or small container than red and... Plant and harvest for your growing zone you live unlike other varieties, … growing your onions! Key is starting onion seed directly in the early spring and harvested by the end of the to... To raise the humidity level first part of a season crop to grow from seed is a difference in with. Brown, yellow and fall over red, and are usually grown from seeds planting out autumn to.. Grown by gardeners either from seed, rather than seeds, seedling transplants, and red yellow! 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Plastic cover over the soil will need to go in the first year, seed, or., loose, and firm the soil around them fertilizer at a garden store year bulbs that you can them. Last frost date number of benefits to planting or open-pollinated, seeds with. Ground 3 to 4 inches high, thin them down to around 3-4 inches ( cm. ( immature onions ) 5-10cm ( 2-4in ) apart raw, boiled, broiled, baked,,... Surface in a multitude of varieties with varying planting times, thus harvesting! ( 10-12in ) apart in rows 25-30cm ( 10-12in ) apart water seedlings when the top of the.! Way to plant out in spring spring onions label the container with the limited variety onion! 6.0 and 6.8 onion you can enjoy these flavorful vegetables all summer and easier... Covered but the growing conditions are basically the same planting and harvesting with regards to white vs. red.. To yellow and fall over more quickly than plants started from seeds ¼! Good drainage space individual seedlings 3 to 4 weeks earlier than onion sets into a rich of. 8 x 6 or into individual tray cells cell with a 1/4- to 1/2-inch layer of compost elongated!