Vidalia Onion

A geographic name

“Vidalia” is a legally protected geographic origin — like Champagne, Roquefort, or Idaho potato. Federal law and Georgia state law restrict the name to onions grown in 20 designated counties of southeast Georgia. Onions grown anywhere else can’t legally be sold as Vidalias, even if they use the same Granex variety.

The protection dates from 1986, when Vidalia farmers convinced the U.S. government that their onion’s unique character came from the specific geographic conditions of the region.

Low-sulfur soil makes a sweet onion

The defining quality of a Vidalia is low sulfur content, which produces minimal pungency. The reason is geological: the soil in the protected area has unusually low sulfur content compared to typical onion-growing regions. Less sulfur in the soil means less sulfur in the bulb, which means less of the sulfenic acid that creates onion bite.

The same Granex onion seeds planted in higher-sulfur soil elsewhere produce a much sharper bulb. The terroir is real and chemically measurable.

A short season

Vidalias are harvested in late April through June; storage extends them through summer, but by late August they’re gone until next year. The short season has driven a Georgia tradition: Vidalia onion festivals, Vidalia onion shipping by mail, and a small canning industry of preserved Vidalia products.