Obviously onions (Allium cepa) are pretty popular, as several people correctly guessed our mystery seeds last week.
Onions common in different varieties, but many are grown in the home garden using small bulbs or "sets."
One of the great things about onions is that they are very forgiving of conditions and easy to grow. They will grow in pots...
they will grow from the cut off bottoms of green onions or scallions purchased at the store (called "nibs")...
and they will grow from seeds.
Where do the seeds come from? Many varieties will flower and produce seeds if you leave them in the ground long enough.
Check with local gardeners or the Cooperative Extension in your area to find out how best to grow onions where you live.