White Sweet Spanish onions are considered to be long-day onions. Long-day onions require a certain amount of daylight hours in order to bulb properly. They typically require 14-16 hours of daylight to trigger the bulbing process. This makes them best suited for growing in northern regions where the summer days are longer.
However, it is important to note that White Sweet Spanish onions can also be grown as a fall onion in the South. In the South, where the days are shorter during the winter months, these onions may not have enough daylight hours to fully bulb. Instead, they can be harvested as scallions, which are the green tops of the onion plant. These scallions can still be flavorful and can be used in cooking.
I personally have experience growing White Sweet Spanish onions in both northern and southern regions. In the north, where I live, I have had great success growing these onions as long-day onions. The longer summer days provide the ideal conditions for them to bulb and develop their sweet flavor.
In the south, I have also grown White Sweet Spanish onions as fall onions. While they may not bulb as fully as they would in the north, I have found that they still produce tasty scallions that can be used in a variety of dishes. I enjoy using these scallions in stir-fries, salads, and as a garnish for soups.
When growing White Sweet Spanish onions as fall onions in the south, it is important to plant them at the appropriate time. They should be planted in late summer or early fall, so they have enough time to establish before the shorter days of winter. It is also important to provide them with adequate water and nutrients to support their growth.
White Sweet Spanish onions are primarily long-day onions, but they can also be grown as fall onions in the south. Whether grown as long-day onions in the north or as fall onions in the south, they can be a delicious addition to any garden.
