Short Day onions start the bulbing process when day length reaches 10-12 hours. Since they are planted in the south during the winter or early spring months, they take approximately 110 days to mature. When planted in northern states in late spring, they mature in just 75 days, but produce smaller bulbs. The earlier you plant them, the larger they get.

Intermediate Day onions are the most widely adaptable since they require 12-14 hours of sunlight before beginning the bulbing process. Unless you live in far south Florida or south Texas, you should have enough daytime hours to make nice-sized bulbs. All intermediate day varieties are exceptionally sweet, but the Candy stores better than others. When planted at the proper time, all varieties mature in approximately 100 days.

Long Day onions do extremely well in the northern states that have between 14 to 16 hours of day-length during the summer. We have the varieties broken down between sweet, storage, and specialty long day varieties for you. If you plant them in the south, they produce a lot of tops, but never make bulbs. These varieties are excellent keepers. Make sure the necks are completely dry before trimming to ensure a long storage period.