When you grow an onion and pick it do you hold to cut stale the top? When you get an onion within the grocery store it doesnt...

When you get an onion within the grocery store it doesnt look like the top be cut off. How does that come about?
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Answers:    It dries up like a babies belly button because they enjoy been picked for a while. When you grow your own you can braid the top beside the onion on and hang them up to dry.
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You can use the top of an onion as resourcefully as the onion itself. The onion is actually the root of the plant.

As for the purchased onion that still have a top, the onion top did not get removed during processing after it be harvested. If this is a 'green onion' , you can use the tops as resourcefully as the root for flavoring sauces, stews, soups and other food. Some people chomp through 'green onions' whole, including the tops.