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I've bought 2 bags of onion sets, red & yellow - varieties unnamed. There's more than I want to plant. Does anyone know whether there's a way to store the surplus till next spring? Or some other use for them? I suppose they're edible but .... ?

I think onion sets are too tiny to save until next spring. They would dry out. They would grow scallions and green onions even if they won’t bulb up properly — it should be possible to pop them in wherever you have room throughout the season?

Unless organic and from source you can verify with, I wouldn’t trust casually conventional onion sets to eat. They might be grown or treated with class of fungicides or pesticides without expectation of them being eaten at this stage, or anything else you can think of. They might have been exposed to things that would be prohibited in a grocery food shipping/storage process.

I always buy a bunch of tiny onions at this time of year, at the Asian market, to grow scallions. They store only 'til mid summer, and the smaller ones dry up, if I haven't used them all. I always use the smallest first, for this reason, planting a dozen or so a week.

Nope, onion sets don't keep long. Trust me. Been there, smelled that.