This is my first year growing sweet onions, but I have grown red onions in the past.
For the red ones I left the plants intact and hung them in bundles much like I do garlic. Shallots also get the same treatment. Both stored beautifully. Once they are fully dry, I'll trim them down and put them in a mesh bag which stays hanging in the basement (I still have a bag of shallots from last year that are holding out great).
As I know sweet onions likely won't store as well, my current plan is to just leave them in the ground and pull them up as I need them. I planted them primarily to use in tomato and onion salads (dressed simply with olive oil, salt, and oregano). Once tomato season is done, I'll pull up any that are remaining and find a use for them.
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