When onions start to mature, the tops (foliage) become yellow and begin to fall over. At that point, bend the tops down or even stomp on them to speed the final ripening process. Loosen the soil around the bulbs to encourage drying. Be sure to harvest in late summer, before cool weather.
Gear: Olympus OM-D EM-1 mark II | Zuiko 12-40mm f2.8 PRO | Zuiko 40-150mm f2.8 PRO