In the South, summer days don’t vary as much in length from winter ones. This region includes Zones 7 and warmer. If you garden in this area, grow short-day onions. Onions form bulbs in response to day length. Short-day onions need 10 hours of daylight.
The Snowball White's big bulbs have a lovely golden yellow papery skin on the outside with a pale yellow flesh with a mild flavor that is great for cooking.