We size our onion according to the USDA when the size and the maturity are at the right stage we will harvest and undercut the bulbs and let them dry in the fields until it is lost 5-8% of the weight after harvest then the product its transported to the packing shed where it is sorted and bagged in a automated process. Quality We only pack mature fairly firm and well shaped onions, free from decay, wet sunscald, doubles and bottlenecks. Free from damage caused by seeds items, splits, dry sunken areas, sunburn, and sprouting, staining, dirt or any mechanical damage or disease and insect caused defects. Temperature Optimum conditions for field curing are when temperatures are at least 24 C degrees (75 F) or exposure for 12 hours up to 30 to 45C (86 to 113F) for forced air-curing. Storage of mild onions will last up to .5 to 1 month at 0 C (32F) and pungent onions will last from 6 to 9 months at 0C (32F).