Onions are a cool-season crop and can stand temperatures well below freezing. They may be planted from seeds, from small bulbs called sets, or from transplants. Seeding costs the least but takes longer before onions are ready. Place the seeds 1 inch apart.
When the plants are about 6 inches high, thin them to one plant every 2 to 3 inches. Eat the extra plants as green onions. Do not transplant onions more than 1 inch deep. Figure 1. Onions grow best when the garden soil is fertilized correctly. Spread 2 to 3 pounds of a fertilizer such as over a square-feet of garden area.
Measure and spread the fertilizer; then mix it with the top 3 to 4 inches of soil. Watering once a week usually is enough in the spring. But you may need to water more often during dry, windy weather. Water onions slowly and deeply to help grow strong, healthy roots.
Weeds are easy to pull or cut when they are 3 to 4 inches tall. Do not let weeds or grasses grow large because they compete with onions for nutrients. If you use a hoe to remove weeds and grass, do not chop too deeply. You may be cutting the onion roots. Pull all weeds by hand when possible. If you find that you have a problem with dry soil, check out my article on how to treat dry soil. On the other hand, over watering your onion plants or any plants for that matter can lead to root rot and eventual death.
The best way to decide when to water is to feel the soil with your fingers. If the soil feels dry 2 or 3 inches below the surface, then go ahead and water. For more information, check out my article on over watering your plants. Try to water early in the morning, rather than at night, to allow water to soak into the soil before evaporating. Adding compost to your soil before planting onions is a good way to improve drainage for clay soil, improve water retention for sandy soil, and add nutrients to your garden.
For more information, check out my article on making compost. Onions require plenty of nitrogen, so consider using a nitrogen-based fertilizer such as ammonium nitrate or ammonium sulfate at a rate of 1 cup per 20 feet of onions. Stop fertilizing once the bulbing process has begun. Onion transplants sets should be planted no more than 1 inch 2. Onions should be 4 to 5 inches 10 to 13 centimeters apart, with 12 to 18 inches 30 to 46 centimeters between rows.
This will allow space for watering, weeding, fertilizing, and harvesting. Now you have a much better idea of how big onions get, in terms of both the bulb and the leaves above ground. If you are looking for heat tolerant onion varieties, you can find some in my article here.
You might enjoy this article on what to do with extra onions. You might also want to read my article on why onions fall over, and when you should worry about it. I hope you found this article helpful — if so, please share it with someone else who can use the information. Hi, I'm Jon. Let's solve your gardening problems, spend more time growing, and get the best harvest every year!
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Skip to content If you are planning on growing onions in your garden this year, you might be wondering how big they will get. How Big Do Onions Get? Onion greens can easily grow to 12 inches or taller. Rinse with cold water. Check out our tips for chopping onions in four easy steps. For more tips on using onions in the kitchen and cooking them correctly, click here.
I have a beautiful lush garden; I plant everything according to the Farmers Almanac - thank you so much! Last year my onions were rotting early in the season I thought it was because I used wood ashes to prevent worms.
I planted onions sets in a different area this year. Same problem, greens start turning yellow and die They are definitely not overwatered - I never had this problem before, some of my friends are experiencing the same thing. Are we buying infected onion sets? Sadly, this sounds like white rot pathogen. The pathogen persists as small, dormant structures sclerotia in the soil. Sclerotia remain dormant in the absence of a suitable host garlic, onion, or other Allium crops , and can survive in the soil for over 20 years.
I did my onion in the fall , now they are in full bloom and very tall and the green tops are hard tuff like, Question is the top bloom are they seeds, onion bulb , if so how what do I do now!
Thank you all in advance for your advice! Happy gardening Diane. Last year I had to replant my onions 3 times because of the worms. Overnight the worms would get ahold of the green part and suck it down their holes, leaving the white part sticking straight up in the air. Do you have any suggestions other than checking onions every morning and replanting as necessary? I thought worms were good for the garden, but man replanting gets old fast when you plant feet of onions!
Just read your article about planting onions. It is quite informative. But I have a question. In one section, you recommend mulch, but in another day that mulch harbors maggots. Please explain. My grandpa loves to tease, and he likes to tell us you should always plant onions and Potatoes together.
He says they do better that way in a dry year. When we'd ask him why, he'd say, because onions make the eyes water! They make my eyes water, but not potato eyes!!! I find that I have much better luck growing beautiful larger onions with transplants.
I plant in early spring, and again about weeks later to have young green onions longer. I plant them close together and thin them out and use as green onions until they are spaced about 5 - 6 inches apart. I then let them grow until they start to die back.
I water my onions very well every day and they do great. I also love to grow my own garlic. Garlic takes longer and I usually plant in the fall and harvest them in early June. I brought them inside, hoping to dry them out and start them this year. Any tricks for those? I believe the are Walla Walla Sweets.
The dirt needs to be removed from around the onion to allow the onion to bulb. Onion maggots is my nemisus. I planted Walla Walla onions from transplants in the fall here in CA. This is the second year that my onions do not "bulb out". They look like leeks with a very slight swelling at the root end.
I do crop rotate. They are beautiful and green and look wonderful otherwise. What am I doing wrong? My onions are attacked by small insects looking like aphids and I have tried normal pesticides but they have proved ineffective during dry conditions, o please help me out if you have ever faced this challenge. I was given a 20 kg saco of red sun shalott sets and planted half, can i pickle the rest or would it not work for some reason.
Is this correct and what results can I expect? We recommend not planting onions deeper than 1. Deeper than that and they will struggle to do well. Where might I find "multiplying" onions When left to maturity they will reseed themselves. As far as sweetness goes ,, it's partially dependent on how much you water. It is fine for them to be damp consistently but "wet" feet soggy is only tolerated on occasion. I get mine from the big seed stores and they can be found on e-bay as well. HI,I have seedlings that were left in the nursery for now more than three months is there a possibility they can groe into big bulbs i can harvest from transplanting,.
Will they burn like potatoes do? Also, some of the ones that tipped earliest were rotting out the root end, any tips for preventing that next year. I've never seen Egyptian Walking Onions, but they look like regular ones so fat? Any info would be appreciated.
My grandma in Arkansas always had me go to the garden to pull a few of these onions for meals. She'd always tell me to pull off the top bulbs and spread them back over the onion patch so they can make yet more onions. As a kid in Llano Texas I had brought back a start of grandmas onions, and before long, I had my own onion patch that we ate from. But after we moved I lost these onions, till I found that you can order them on amazon. My order came in around November I think.
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