Before becoming a Tomatoville member, my answer would be one sentence long:
I buy sets/starts from a mom and pop shop in January.
But that's too simple
![Rolling Eyes](images/smilies/rolleyes.gif)
Last October, some of the members were writing about starting onions from seed. "Salt, you gotta try it too"... I just happened to have a bunch of onions that I grew last spring. Some of them had green shoots starting, so I planted them in October. They overwintered just fine and before long, I'll have enough onion seeds to plant the world with onions.
![Twisted Evil](images/smilies/twitchy.gif)
Onions are biennials. The second year, they produce seeds. So, it looks like I'm going to learn how grow them by seed.