Harvesting and Preparing Onions for Long-Term Winter Storage

The shelf life of onions depends on the timing of the harvest and the method of winter preparation. Harvesting too early or ignoring maturity signs often leads to bulbs rotting in storage or sprouting before spring. Timing the Harvest Harvest dates vary by cultivar and weather conditions. Gardeners should rely on the plant's physiological state rather than a fixed calendar. Standard Bulb Onions: Typically ready by late July. The primary indicator is the yellowing and gradual falling away of the foliage (tops). Leeks: Harvested later, usually in late August or early September. Maturity is marked by the stems becoming soft and flexible. Before digging, verify the bulb's condition: it must be firm, free of rot, and have dry outer scales that separate easily from the vegetable.