I would like to experiment on growing onions form an onion, instead of buying each year seeds, sets or little plants.
I heard that planting one onion does not immediately gives more onions. Opposite to shallots, which apparently you can plant and you'll get a bunch of shallots instead. And for leek you can do the same.
So my question is more or less what is the life cycle of an onion? Can I plant my onion, where from I'll get a plant and seeds, which I can use next year? Do I need several plants or are both sexes present on one plant?
On the question: Onion seeds v. onion sets I read onion seeds are perishable. So if I harvest them this summer I should immediately start them again (in little breeding pots)? But you should only plant onions right after winter? Can I dry them and use them for the first coming season?