|Walla walla grown at The Orchard in North Las Vegas.|
Both northern and southern onions can be grown here well.
Onions are heavy feeders of fertilizer particularly nitrogen. They do well if you put phosphorus in the soil prior to planting. I like to feed onions with nitrogen lightly, monthly, during their active growing time. It is not so important when the temperatures are cold and they are not growing fast.
|Wait for the tops of onions to fall over before you harvest|
unless you want to eat them fresh and not for storage
So at this time of year begin to watch for onion tops that fall over. Once they fall over you can harvest the bulbs and trim the tops. You can also leave them in the soil for a week or two and harvest them fresh if you want to. Once the tops have died completely, I would get them out of the ground.