Onions need full sun,

fertile soil, and regular water.

They like a long growing season and grow very slowly, so many gardeners start them indoors in January and February.

In some climates-zone 8 and above-you can start many varieties in the fall for an earlier finish in spring. 
Many onions need long summer days to bulb up. Northern gardeners will be assured of long enough days, but those further south should read the descriptions carefully.

If you live below latitude 36 N, you should choose a day-length neutral types. 

Harvest when the tops begin to dry up and fall over, then shade-cure for a week before storing. 
Allium cepa/W/Matures 14-17/Harvest 0-6/Yield 100-540/Spacing 4"
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1) Tip for January

Don't give up on growing onions. Big firm bulbs are simple once you know the facts about how onionsĀ  grow:1) Onions are not roots. The true roots emerge from the little plate on the bottom surface of the onion. The bulb itself is made from the swo...