Stoney Acres Gardening
10 minutes
Short-Day Onions Bulb at 10–12 Hours of Daylight, Matching Mild-Winter Latitudes
Short-day onions such as Texas 1015Y and Granex start bulbing at about 10–12 h of daylight, so at about 25–35° latitude they are set out October–January and bulb in spring; long-day types need 14 h or more.