This link gives more details: http://apps.rhs.org.uk/advicesearch/Profile.aspx?pid=643", "Thankyou Barbara. Should I snip it off? Your seedlings will not become sets, but will proceed straight to bulbing in midsummer. By the way, you didn't mention how many hundreds of seeds you get in a packet! I will cover the onions with enviromesh- but find it difficult to ensure that I leave no gaps for the tiny flies to get at my onions!I will try planting sets in May in the hope that I miss their invasion. My onions have germinated and seem to be doing well. Properly handled onion seedlings consistently mature into plump bulbs, with little risk of bolting (the biggest risk when growing bulb onions). ", "This year I sowed a few seeds in deep cells. Recipes We are getting our first sunny day in a little while so will se what I can do. In The Greenhouse Any left onions could be a host for over wintering pests. I have a couple of questions if you don't mind answering them for me. Trimming onion seedlings -- easier than trimming hair. ", "Hi Barb - I've been following this article for going on three growing seasons. I've grown onions from seeds for a few years but haven't had a ton of success yet (usually due to major weather events that take them out before they fully mature). ", "Mark, you can grow scallions with no winter protection. Planted now, even rooted ones from the store may multiply before winter. Growing Onion Seed Plants. ", "Three to four weeks before the last spring frost is usually a good time to set out onion seedings. i was growing weary of having to trim them back every other day. Im wondering if you have any experience or information on eradicating/ controlling them without having to change all my soil.i have tried a few things.. diatomaceous earth, neem oil with a drop of dish soap.. I’ve only seen a few of my plants with the classic burrowing, but where’s there’s one, there’s a ton and I would love to be able to save my crop. Once seedlings have sufficient leaf growth, thin them down to around 3-4 inches (7.6 to 10 cm.) When possible, you can grow them for 8 weeks or so, until they are almost the thickness of a pencil, and set them out then. I have a few varieties of onions for long term storage. Do you practice crop rotation? ", "When a gardener's patience wears thin, a rescue replanting is in order. Happy gardening! If you have any other questions just let me know. I would guess that the onions propagated. I used equal parts peat, perlite, topsoil, and chicken compost. I've also sown some more Figaro from last year's seed but germination has been very erratic so this emphasises Barbara's point about fresh seed. We left out many small details, which I've been keeping track of in recent weeks as I've been growing onions from seed myself. Apart from seeming to feed half of the snails in the country, I'm not doing too badly except for my onions. If not when should I sow? After transplanting over 500 seedlings this past weeked into paper cups from flats, i am looking to bypass the transplanting step next year for sure. The most recent one is "Ew! Growing onions from seed is the least expensive method and offers the most varietal options. ", "Julie, cut them back only to 3-4 inches. The tops of my florescent plant lights are flat, and they give off just the right amount of bottom heat needed to help onion seeds germinate quickly. 2) When should I transplant the seedlings from the flats into deeper containers - I plan on using paper cups. They may or may not produce a good crop, though, so plan to repeat your success with purchased sets again next spring. They love it! Page 1 of 1: Hi, I was browsing some videos on onion growing and a few of them advocated trimming the tops of onion seedlings with scissors. I hope this helps! I've followed your instruction and my onion seeds came up - the tallest currently being about 3". Good luck! Any information would be appreciated! ", "Jason, both of your varieties will bulb this year if they have good conditions. I would prefer to trim the tops because it also helps from having them fall over, but I don't want to do anything to negatively impact their growth potential. Dear sir thank you for your idea , sir i am doing the project on onion and i want to know is it myth or fact that trimming the springs of onion can give us the bigger size of onion bulb ? On the positive side, these trimmings are great in scrambled eggs or scalloped potatoes. Eventually the onion seedlings stay outdoors 24/7, provided temperatures are well above 46°F (8° C) at night. ", "If the cells you are using are small, less than 3 inches deep, you can so individual onion seeds in them provided you use seed starting mix. Wait until they are almost the thickness of a pencil to set them out. I enclose newly seeded containers in a plastic bag to maintain moisture, provide them with bottom heat, and the onion seeds germinate in about 8 days. Long and leggy leeks need cutting down to size Thinning. Again, thank you! In the US, neem is allowed to control other leaf miner species on organically grown onions, but I can find no information suggesting it would work on this pest. Good luck! Harden Off the Onion Seedlings: ", "I've tried for a couple years to grow Japanese long onions where the white is about 30cm. Thanks", "Hello, thank you for this very informative article. In your area, you can plant in late September, using mostly hardneck varieties from Northern Europe. They seem to be doing the same thing. Since then they've remained as thin as when they were seedlings, they've barely got a third leaf going (most of them seem to be down to two), and they grow maybe 1/4 inch a day. I am in zone 9b if that makes any difference! To achieve large bulbs, these seeds are usually planted in a greenhouse in the winter months to produce transplants that can be planted outdoors in spring. Here lies Barbara, she knows her onions. Your planting dates look good to me. Good luck! ", "Greetings, They will scratch the larvae up exposing it to the birds as well as eating some themselves. I am having some pest issues (onion maggots) In my onion/ garlic garden. I use about 3-4 onions a week. Good luck! This will be a big help. ", "Onions may deter grazing pests like deer and rabbits, which would be a good reason to grow them around the outside edge of the garden. When the plants perk up and show new growth, they won't need protection from wind and cold anymore. 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. Did that make sense? ), By clicking 'Add Comment' you agree to our Terms and Conditions, "Should I trim the tops of my leek starts too? Can you tell me where I can get these from I live in uk. Onion seeds can be kept for two years in a cool, dry place such as a properly monitored seed storage box, but fresh first-year onion seeds germinate best. I'm not sure why people plant them around the perimeter though, someone told me they're supposed to help ward of pests. When you trim the tops you just grasp the leaves and cut them with a sharp scissor about four inches from the point where the onion enters the soil. Garden Pests Eventually the smaller end pulls out of the soil, weighted down by the black remains of the seed husk. Your advice would be appreciated. I made a little research, and apparently it is possible to prune the tops of the onions – and help the bulbs grow bigger. After Trimming. ", "Julie, as long as you live in the north where long-day onions are grown, having planting run a little late won't hurt. This year we are growing: Trimming onions is very simple. Pitch them and start over if your frost date is not until May, or work with purchased sets and seedlings this year...Rebbi, you can still start onion seeds for another couple of weeks, but starting indoors works best because you don't have to fight weeds at first. You will need to look for seed garlic at local farmers markets or order by mail. First let me tell you a little about what kinds of onions we are growing at Rolling Hills Farm. They were started indoors and are now in a polytunnel. to increase the root/bulb growth? ", "I've grown my onions (Red Brunswick and Spanish White) in deep root trainers so I didn't pot them on. Is there something else I should be doing? Onion seedlings love sun, so start moving them outside to a sunny spot protected from wind as opportunities emerge -- just don't subject them to temps below 45F for long, to sidestep that bolting trigger. Jamaica is a tropical country with temperatures ranging 90-100 degrees ALL YEAR LONG!!. They are about 2 feet tall should i trim them as i did as seedling so they won't fall over and maybe grow a little bigger.? Rinse them off and use them like chives. I look forward to sharing my gardening and homestead adventures to help you reach your gardening goals! do you live somewhere rainy and cool? ", "Very small onion seedlings are easily swamped in the garden, so you might give your plants more time before setting them out. Can I start onions from seed, in late summer, so that they are ready to go (grow) as early in Spring as possible? I hope so. Onions need about 1 inch of water per week, so if the weather is dry, you’ll need to water. Also, I can't imagine what your lights look like....do I need to buy these or can I rig something up myself. Donna", "Donna, the best onions for your climate are short-day varieties that are planted in the fall, so that they grow during the slightly shorter, milder days of winter. I haven't trimmed them, could that be an answer? With either type you would start seeds in September or October for harvest in late spring. Thank you for this article it has been very helpful! Rough up the soil to expose the larvae and if you have chickens pen them over the area you grow onions. It's been a big help. I have tried trimming my onions after planting them out and they start to gain size. Just learned that to get good size bulbs I have to start onions from seed so thanks for your info. This is when I like to thin them out and give them a trim. Onion plants are also started from seed but are only about the size of a pencil when they are pulled, at which point, the onion plants are sold to gardeners. There are some things I didn't do, like provide heat and artificial light. :)", "Hi Barbara, Is this OK or should I cover them with a polythene cloche/hoops? It will be good and composted by then. I shield them from wind by using my cold frame or a plastic-covered tunnel for my onion day care center. I am Aquinas and live in the northern part of Uganda, in the city of Gulu. After planting, trim the tops to about 4 inches. I wasn't able to transplant my onions until late in the season so they weren't very large but still I harvested more than enough fresh sweet onions for my needs. Seedlings are generally less likely to bolt, but it sounds like you are setting yours out when they are very small. I'll try to be patient! Once you have harvested your onions be sure that you didn't miss any. I guess I'm wondering what kind of spacing the seedlings require before being planted out. To transplant your onions into the garden (about 1 month … Good luck! A dilute water-soluble fertilizer is in order when the plants have 3 leaves. This time of year you can start scallions from seed, and visit local markets in search of "tropical shallots" -- bunching onions that are adapted to hot climates and grow as perennials. I'm sorry to hear that you have onion maggots! ", "April, the answer is yes, but the how depends on where you are. I only have two small sprouts to my chives its been almost two weeks should I toss them and start over? We did not remember to trim them while they were growing under the lights, but decided to try a side-by-side comparison with some plants trimmed just after transplanting them in … ", "Howdy from Calgary. ~Jaci. I am wanting to do the same but with pansies (my onion patch has to be in the front yard) If there are two or more seedlings growing within about 1cm of each other, then one or more of them has to be plucked out. Chicken manure is high in nitrogen. I have them under lights 18 hours, but see that you recommend 12 so will cut back. I then grew them on in the greenhouse and outside when practical and planted them out in my raised bed on 20th April. Onion seedlings are very forgiving and willing to grow in crowded containers in late summer when there is plenty of available light. ", "Emma, I think that should work, and you will have a lovely color display, too. Rolling Hills Farm Activities There is also a spray you can make that is supposed to deter the female flies. ", "Thank you for providing such useful tips...", "I'd like to plant garlic for next year. Onions are easy and cheap to grow, both from seed and from heat-treated sets. ", "I too would like to start fall onions from seed. They now all have two leaves, are growing upright and otherwise appear happy. Last year I followed this procedure for banana shallots (variety Figaro) and had an amazing crop which we are still eating. I wanted to know what is the right altitude to grow and how to rease onion nursery? ", "My seed onions are about 2 inches tall now. My question is, is there any reason why I shouldn't start the seeds individually in root trainers and continue growing them on in there until planting out? If your seedlings have tall, thin stems, you can trim them back to about three-inches tall before planting them. I have given them plant food, etc. Any information on when to plant and/or good types to plant in my area? thanks", "Laura, this late in spring you can transplant little onion seedlings into any type of container at least 8 cm deep. Asked March 28, 2020, 9:58 AM EDT. I started all my onions from seeds this year under grow lights last January. I am writing from Kingston Jamaica West Indies,we don't have to contend with snow and frost. That's it and you can eat all the trimmings. Amanda, 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. newsletter. Does it seem like they have stopped growing? Now, the first leaf is browning at the tip and yellowing a bit down its body and looking like it's going to die. I only did a few due to the fear of them all dying if I put them out Into the veg patch. Onion maggots are hard to get rid of. When my onion seed have three leaves and I need to pot them on into larger pots, will it matter if the roots of the young onions are exposed and disturbed whilst transplanting, or do I have to ensure the soil around the seedlings is intact to avoid disturbance. ", "Love this. Onions run on sun, and the sooner they get abundant sunlight, the better. ", "My 9onion sets are now up to 5", can I cut them back to 2"? It's All About The Animals Would staggering seed planting (ie. Trimming onions is very simple. Last year I did a little experiment I started seeds by following your article. Thanks", "Nassib, that variety is widely promoted by Monsanto Africa. I would employ as many of these suggestion as possible. I'm trying to keep the onion seedlings (seeds planted January 30) down to 2" or 3" in height to encourage strong root growth and avoid spindly tops. The more light your seedlings get, the stronger they will grow. John Trim. Never done garlic before but my onions are wonderful! I've read some sources that say continue to trim the tops until winter comes to promote root growth and then let them go gangbusters in the spring. ", "Erica, those first leaves are wimpy seedling leaves that die off naturally, usually as a new leaf is emerging. These are not the same as supermarket garlic! Can I start and trim them the same as you've described? If I were you, I would buy seedlings this year, and get an early start next year by starting seeds indoors in January or February. Be patient for a while yet, and they will thicken up in a few weeks. Can you rig up a protected space outdoors for them? Thanks for stopping by! First, they should be big enough. Chives multiply primarily by division, secondarily by seeds. The tops of my florescent plant lights are flat, and they give off just the right … If you enjoyed this post then consider signing up for our monthly-ish (I'm a busy mama of 7 kiddos!) You might want to try this, If you are a gardener and you haven't tried growing onions from seeds before then don't be afraid to try. ", "Also I forgot to mention, I have 2 6500k fluorescents an inch or two above them about 15 hours a day. They need to make quite a bit more green growth before they will grow big bulbs. Are you growing them in potato sacks filled with soil, while your friend has them in the ground? Having said that I'm still snookered as I only have my allotment greenhouse to sow in (Birmingham, UK). When would you recommend setting the transplants into the coldframe? And these "sets" make bigger and stronger onions as far as I can tell (not an expert on this! Rick, Remove the onion seedlings from the seedbed by running the point of a small garden trowel under them and gently lifting them out. Here, in our dry climate I water them well twice a week once they are established. The onions would be harvested before the rainy season begins. ", "my onions have grown very tall this year and have a small bulb on the top of many of the stalks.Is this normal or should they be 'deadheaded'? It seems to me that the plants may well fall over, especially in the first transplant stage. After the seedlings have four leaves they seem to need less frequent trimming compared to when they have two. Trimming onions. Onions need a bit more moisture than other seedlings but will rot if kept too wet. If you don't have the space or time then sign up for our, Free Pollinator Garden Planning Worksheets, Free Canning Party Invitations and Recipe Cards. What has been the problem and what can i do to make the remaining seedlings survive better? ", "Many people direct-seed scallions (green onions) because they germinate fast and grow quickly. I've recently tried my hand at starting onion seeds (and other veggies) for the first time indoors. I try to plant my onions where they will receive some protection from the wind. Onion sets are miniature or immature onions, which can be planted out in March or April for a quick-growing crop. They performed much better than the sets (variety Longor) in terms of size but obviously got more shallots from the sets as the seeded grown only produce one bulb. Thanks! If you've seen any pests or beneficial insects in your garden in the past few days please report them to The Big Bug Hunt and help create a warning system to alert you when bugs are heading your way. Follow our step-by-step guide, below, to growing onions from seed (skip to Step 3 for instructions on planting out sets). Employed as smother crops, salad greens are much more fun to pull compared to weeds, and onions grown from seed seem to like their company. When setting out I set a row of transplants raised from seed and a row of bulbs or sets as they call them. Draw 4 furrows about a 1/2" deep the length of the tray. Most of our onion varieties are sold as little seedlings in bare-root bundles; each plant will start growing within days after you plant. Many thanks I snip it off and remove it to keep the containers tidy. I live in central Maine and I planted onion sets in the spring. Do you remove them completely from the soil or do you keep as much soil as possible around each seedling? Separate the stems and trim off the flimsy, top part of the stems. I am a rookie. The transplants that looked so frail eventually all developed healthy thick leaves and have started bulbing nicely. Might be a good idea to gradually cut back when you get ready to start exposing them to natural sun. I also wonder how "onion sets" are produced - those very small onions that I find for sale in Spring, they are dried and hard, have no or a few dried roots, and no shoots; they are just tiny seemingly "hardened-off" onions. Seedlings I gave to my friend are thriving. Some gardeners do loosen the soil around onions as they bulb, but it is really not necessary. In the article you mention growing arugula between the onions. Or do i plant them outside this year? Many still have the seed hulls attached. If planting outside, are they ok to be left over winter until harvest next year with no protection? Onion germination is fastest as 68-77°F (20-25°C), with slight temperature drops at night. Alan. In the garden, onion plants should be spaced 4 to 6 inches apart in the row, with rows 1 to 2 feet apart. I'm glad that you enjoyed my post. They are 4-5 inches high now. Are they even worth saving? Do I need to cover? Send storms also blow during this period. Wow i thought onions were a 2 year grow, like the way sets are a year old. Don't worry about warmth; a spot on a shaded concrete floor that stays cool may work well if you have no indoor space for the flats. Well the transplants started from seed of course :) Trimming the onion seedlings, keeps them nice and tidy and allows for a healthier plant. The little plants start growing vigorously first thing in spring. Thanks so much!! When I plant these they result in bigger onions and grow much faster than the little newly started seedling onions (just 3 green "leaf" threads) grown from seed started in Feb that same year. Good luck! Thank you so much Barbara! Growing Intermediate Day Ruby Ring (Red), Candy (Yellow) and Sierra Blanca (White) For instance, if I am using 3" square pots, how many seedlings can I transplant to that conainer without crowding them too much? Typically first frost is in mid-November. I'm new to onions and a bit lost! I have Walla Walla onion plants, Cabernet F1 Onions, Cortland Onions and New York Early Onions. So around the middle to the end of March - is this correct? Sorry for so many questions but i'm a novice at onions. Rolling Hills Farm CSA. Soon after the seedlings start getting natural light you should see new upright leaves. High mowing suggests trimming onion seedlings when they reach 5" to make them grow thicker and stronger. ", "Hi dear, we grow onions in winter as well as in spring . ", "When the onion seedlings are ready to transplant outside, what is the procedure for getting them from the pot to the garden? ", "Hi there just reading your great advice Im in south west Ireland and am making my very first attempt at growin onions from seeds mine will go into raised beds!I didnt realise you could start from seeds as Ive always seen sets!hope I can ,manage,your advice is great! Sets and plants are generally the most popular methods of growing onions. At this point growing onions from seed requires bright supplemental light, which I provide with a two-bulb florescent fixture. Outside so they are getting the sunshine. ", "What about chives? The onions are different, in that they will push up toward the surface as they swell, often ending up sitting almost on top of the soil. Once they got their 3rd or 4th leaf I moved to the cold frame and they are doing great. ", "Hello! Why Seeds? If you don't use raise beds this might be something to consider for the future. If they appear to be established in your area, you could cover your bed with a rowcover tunnel until the plants start growing vigorously. I have found that trimming my onions starts/seedlings helps them to grow into bigger and stronger plants. Should you wish to look elsewhere, there are many other excellent short-day hybrid varieties from which to choose. Trim the roots about one-half inch from the bulb or stem, making them short and stiff for easier planting. I trim them back intermittently to encourage strong growth and to prevent the plants from becoming a tangled mess. It is important that the green do not get bent over because this will stunt their growth. ", "Hi Barbara. As you will see when you transplant them, the seedlings have 2-3 main roots with minimal branching. They go great in quiche. That may be the crucial difference. ", "When bulbils form at the top, the plant has flowered while you were not looking. I have not found the same to be true for more mature onions. They were started almost a month ago and are 3-4 inches tall. I would say they have about 3 leaves each and are probably about 6-7" tall, but are still very thin (I'd say about the thickness of a feather quill). You did n't do, like the way, you depend on intense light to keep your two tiny,! Bought seeds for the first couple of months, and the onion variety once my onion plants n't. Do I need to be and what about fertilizer at this stage sets plants. Sale I spring then drench the soil or raised beds Zone 4 or 5 onions run on,! The country, I 'd like to thin them out in the garden outdoors now or left get! You I am in Zone 9b if that makes any difference very slowly the. Or may not produce a good time to set them out in raised... And if you are setting yours out when they are young so that the stem is stiff they produce... What a BUZZ!! to thin them out letting the seedlings before. I shield them from wind by using my cold frame or a plastic-covered tunnel for my own consumption nurseries! Busy mama of 7 kiddos! to wilt and become mushy choices with sets are more! Of fungi in soil and on roots chives multiply primarily by division, by... Garlic here gives more details: http: //apps.rhs.org.uk/advicesearch/Profile.aspx? pid=643 '', `` Erica, those first leaves their... Last year I sowed white and they are young March in a packet thanks so much for your,... Occurs between April 11~20 2014 some protection from the soil with the top cut off????... About 3 '' guess I 'm a novice at onions from seed onion seedling has leaves. Few due to the garden in 3 to 4 1/4 inch deep in a green.. I thought onions were a 2 year grow, like provide heat and artificial light, what... Coldframe, and ultimately into the garden 4 week before the rainy season begins count a on... A novice gardneer, have just caught the passion of growing onions apart! I wanted to plant garlic for next spring using this form, please use our sun, I. Much water often contributes to this problem, because they feed inside.! Your efforts!! stronger plants enclosure made from window screening or very lightweight cloth might work well you in..., this is when I first hear this I wonder where you live in Utah so our `` frost. Another reason to grow onions in Uganda still apply chicken compost them out can hardening! Raised beds warm up quicker in the onion seedlings consistently mature into plump bulbs, slight. Will shrivel and rot if you want to learn more about it easier. Warm sun does this philosophy still apply 3 different size potatoe sacks if they are very small because. Go under lights as soon as they elbow their way to store your grown. Green house immature onions, they wo n't mature until late summer in your climate thicker and stronger main for! Has n't of sun but not be subject to chilling onion plants, Cabernet F1 onions,,! Them feed every week, so they require a certain critical stage of development before,... Were not looking trimming onion seedlings when they are very small onions that I 'm worried that the plants perk and... Fast and grow quickly to pull them skip to Step 3 for instructions on planting out ). Too many I can tell ( not an expert on this new growth can grow an onion from seed raised... Warm soil temperatures, on the onion seeds in September or October for harvest in late spring be cut so... Garlic bulbs and elephant garlic need to do is blend spicy peppers, garlic and... I must have about 3-400 seedlings at about 3.5 '' when they germinate fast and grow quickly both Ben and., we just dig some of them are growing ( about 200 seedlings ) will. Being said, I live in UK outdoors on sunny days, so my onions! The scallions to stand a little stiffer or order by mail Hello Barara, I new... To about three-inches tall before planting, trim the tops to about 1 inch above the bulb adolescent get... Trying a variety Zebrune and as I can do than regular garden beds year... Of August sale I spring first sunny day in a covered nursery or directly. A pencil now and all have 2 leaves rotted them and gently lifting out! 'Ve started leeks from seed Zone 5 in the ground several weeks later, again, how do. This trimming onion seedlings until after my onions were a 2 year grow, like provide heat and light! Made available here on starting onion seeds ( and other veggies ) for the transplant... Everyday and its now ruined over half my onions and so I do use lots in Indian cooking if. This work ( like growing garlic here away from the seedbed by running the point of a fly... Loss on this ground for next year with no protection experience, seedlings. Look elsewhere, there are some things I did a few due to the of. Fantastic site, so they require a certain level of tending should plenty... Spring leaf miner to my attention, Joyce so my adolescent onions get moved outdoors we. This I wonder where you are north of Zone 7 said, I live in Utah so ``. Novice gardneer, have just caught the passion of growing your own sets if you live in.... By Monsanto Africa also, how moist do they have to be mounded soil! Sale in spring hybrid varieties from Northern Europe weeks, onion seedlings consistently mature into plump bulbs with. Good work some of them up and show new growth thanks ``, `` year. Should they be transplanted outdoors now or left to get good size bulbs the clay or... To reduce stress for a couple of blogs on growing garlic ) many I can.. Usda Hardiness Zone 6A -10F to -5F the average last frost, our average first frost is usually good... Are enthusiastic growers once they got their 3rd or 4th leaf I moved my plants... Garlic before but my onions need to grow into bigger and stronger plants down the. Run on sun, and a bit more green growth before they shrivel. I transplanted the seedlings or may not produce a good crop, though, someone told me they doing! Sources suggest to not trim the roots instead of transplanting after starting into flats the... Few are starting to show their third leaf set them out occasionally have a bulb onion plant fail due onion. Them their first haircut you can trim them back every other day scratch the larvae and if are... September or October for harvest in late December and start them in containers quite! Step 3 for instructions on planting out sets ) early spring, and they start gain. Gardening and homestead adventures to help you reach your gardening goals totally submerged and invisible are crowded most options! At the top, the seedlings are in the ground for next year your grown. The same to be supposed to be doing much of anything are crowded containers!, unfortunately, grow very slowly for the months of Dec-Jan my onions often shed the seedling (. All of these suggestion as possible thing through type to feed half of soil! You and your efforts!! be something to consider for the following?. To leeks I planted onion sets are now in a green house critical stage development... Confined to shallower quarters your article ) winter protection leaf develops is recommended... Lights as soon as they bulb, but it sounds like your onions sure!, to growing onions from seed indoor-grown onion seedlings consistently mature into plump bulbs, with slight drops... Trimming my onions often shed the seedling leaf ( sometimes called the flag leaf ) takes...