I’ve been growing onions for 34 years and they’re one of my best crops. Took me about 3 years of gardening to find out that the best, the biggest and the healthiest onions come from transplants. But what I didn’t find out until recent years was — how easy and economical it is to start the seed and grow your own transplants.
It’ll cost you about a penny a piece ( or less) to find out for yourself.
Great for either the Winter Sown Method or Indoors
Growing onions from seed is a piece of cake!
I started six varieties of onions on December 25th via the winter sown method. Even though the ‘soil’ in the jugs has been frozen solid off and on since then, my guess is that the sun warmed it long enough for almost all the seed to germinate.
If you start indoors with warmer soil temperatures your germination will be quicker — sometimes only 4 days. My winter sown onion seed took about 2 weeks to germinate. Had the temperatures been even colder, I may still have been waiting.
But, they’re up and growing beautifully. Once they get into my garden with its good drainage, full sun and lots of organic matter they’re gonna make great onions.
When to Start Your Onions
Allow at least a week for germination, 8 weeks growth before transplanting and anywhere from 12 to 18 weeks of growth in the garden.
The idea is to plant in time for the onions to get as much top growth as possible before length of daylight in the summer triggers bulbing. When that happens —- the onion stops making the top and starts making the bulb. The longer you can have your onions growing in the ground before that happens the bigger they’ll be.
(Keep in mind that some varieties get bigger than others. 3″ could be big for one variety and 5 or 6″ could be big for another variety.)
How to Start
Follow my instructions for starting seed in my post on Seed Starting with the following differences and additions:
- Use jugs or plastic pots that give the roots of the onions at least 4 inches of soil.
- Just scatter densely (maybe 1/8 to 1/4 inch apart) and don’t worry too much about spacing at this time. The roots will separate readily for transplanting. And at this time in their life they don’t mind a bit being close together.
- Cover with about 1/16 of an inch with medium that is already wet. (If you cover with dry medium, it’ll be hard to get the medium wet and trying to do so will rearrange your spacing of the seed.)
- A word of caution: If you plan to grow them indoors under florescent lights rather than move them immediately outdoors as I do, be carefully of how much light you give them. It only takes 10 hours of light to trigger bulbing in some onions (the short day varieties). You sure don’t want that at this point or you won’t get onions.
- If need be — give them some foliar spray like Liquid Kelp Spray. (I don’t usually do this, but might this year.)
- Harden off your onion seedlings before planting in the garden. If you need some hardening off guidelines see my post on Hardening Off Your Seedling.
What if you don’t have enough time this year to get your onions to maturity?
Suggestion #1 – Buy a packet of seed for $1.25 or so. Start your onions. Grow to replanting size (about 8 weeks) and plant in the garden. The worse that can happen is you’ll have a great crop of onions a bit smaller than usual. If you’re really late — you’ll have a crop of spring onions. How bad can that be?! Not to mention you’ll know what to expect next time around.
Suggestion #2 – Start seed in mid July or August. Transplant to the garden in September for wonderful fall spring onions. Here in Virginia I have spring onions all winter long.
Don’t wait thirty some years like I did before starting some onions from seeds. It’s easy and where else could you get wonderfully delicious and healthful organic onions for a penny or two a piece?!
Organic Gardening is easy, effective, efficient and it’s a lot healthier
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