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I just read the article on onion sets. Since I didn’t do this last year, can I create sets indoors over the winter? Or is it easier/better to grow from seeds later in the winter/spring and then simply transplant?
You can create onion sets indoors if the conditions are right; you will need room for seeds to grow into seedlings and you will need to create the same number of hours of daylight required by the variety you are growing to trigger the formation of a bulb. An onion set is a small onion bulb and so bulb formation must occur before you harvest and dry the sets for planting later. Try growing a day-neutral variety and give the seedlings 12 hours of light each day. It will take 40 to 60 days for bulbs to form if conditions are right. The key for bulb formation is selecting the correct variety for your location. The short answer to your question is: sets can be grown indoors; growing outdoors may be a bit easier.