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In the South, where onions are typically sown in the fall and transplanted to harvest in late spring, short-day varieties are the choice; in the Northeast, where bulb formation happens in the summer from spring transplants, long-day varieties are indicated.

To a good approximation, Saturday ended the annual long-day season.

Long-day onions bulb when day length reaches 14 hours or more.

If you’re gardening north of 40 degrees North latitude, be sure to choose long-day onions.

Long-day cultivars — American summer berries — are, he said, “optimized for mass production,” at the expense of flavor.