How can you grow a onion without planting a seed?

Answer 1

Onions can tend to bolt if they have inherited it genetically, so seed should not be saved from early bolters. Shortage of water and planting at the wrong time can also be a cause. If your plants are bolting they should be harvested.

Answer 2

Well, at a certain point you are not going to be able to keep them from sprouting. But there are things you can do to discourage it: keep the onions dry, store them in a mesh bag or slatted plastic container that allow air circulation, don't store a large number of onions together if you can avoid it, don't store them with a lot of other fruits and vegetables like apples and potatoes that might give off ethylene gas or moisture, and of course, you want to refrigerate any which have been cut.

The best way of preventing this, however, is to simply make sure you use the oldest onions first, since they are more likely to sprout than fresher purchases.

Answer 3

You can use onion sets.