Overwintered onions are in the ground a lot longer than their summer counterparts – roughly 300 days. Because of this, they have more time to develop a vigorous root system, which means they grow more strongly on heavy soils. In addition, overwintering types do most of their growing during spring, when soil moisture is plentiful. They mature and dry down in early summer when the days are at their longest. All these factors add up getting larger onions with less effort.

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