sowing onion seed?

hi folks.going to have a go at growing my red onions from seed this year,but i'm a little unsure how to go about it.do you sow 1 seed per module or do you "broadcast " them like leeks and separate them later?.ive got a cold greenhouse to keep them in .is early january about right to start them off? hoping to get red onions that dont go to seed this year!thanks for any advice.

I start mine off in trays (make sure the compost is right up to the top), and I keep them in the conservatory until the frosts have gone, and then plant them out.  Got lovely mammoths this year

The 4 to a module planted out works well for kitchen size onions. Best to put 5/6 seeds in each module to guarantee that you get 4 plants. It does not matter wether you bother to thin them or not.

If you space the modules at 1 ft apart along the row it will give you the same population as spacing them at 3 inches. I have tried one row done each way to compare and number and weight yield are the same. The module ones are less even in size, but that is not a bad thing in the kitchen.

Two advantages with modules of 4. They are quick to plant out and at 1 ft apart they are easier to hoe round.

I know of a few people on our lottie, including myself, who all sow theirs between Christmas and New Year.  It gives you that kick start for the following year kind of feeling.  You feel as if Spring is on its way - then winter tells you different by dropping a couple of feet of snow