When we first started gardening we planted our onions from sets in the spring. That’s the way we did it when I was growing up. But year after year I was disappointed that the bulbs didn’t get as big as I’d like.
Later we tried putting out transplants in the spring. The results were better, but still usually unsatisfactory.
Finally we settled on the method we use now–planting from sets in the fall and overwintering them. Now we get large bulbs, and while we do have some bolting, we harvest those as spring onions so it’s still a win.
This years onions are the best-looking that I can recall, likely another consequence of our very mild winter.
I’ve already decided to significantly increase the amount of onions we grow next year. We never have enough. To make room I’m going to reduce the amount of garlic we grow, as we always have way more of that than we need. Fiddling around with how we do things is part of the fun of gardening.