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They'll grow fine in pots; I grew 8 Kelsae onions in hadopots (one in each) and the smallest was 535g (approx. 1 lb 3 oz) and the largest was 1'83 kg (4 1/2 lb). I grew them outside in UK. They are day long onions, but do not keep well, so the last of them, which I harvested in Aug, I used in last night's batch of curry, and only just in time, as it was starting to go.Onions aren't that cheap in my area and I've started growing onions in a few pots to see how it turns out. I love dishes with lots of onions in them so I want to grow my own and also make use of the green leaves as seasoning for stew or porridge. I hope they'll grow well in pots.
I reckon you could grow 4 ordinary sized onions in a 12" pot, one in the centre, three in a triangle round it, spaced four inch from the middle, two inch from the edge.