Harvest onions when their tops begin to turn yellow and fall over. Then onions need to be ‘cured’, or dried, to store through winter without rotting. In a few easy steps, our article (with video) will explain how to harvest and prepare your bulbs for storage. We'll also show you how to make an onion string. See: Almanac.com/video/how-harvest-and-store-onions | The Old Farmers Almanac