Whole onions should be stored at room temperature in a well-ventilated container, such as a wire basket, perforated plastic sack or open paper bag.

Keep storage onions in a cool, dark, and dry place. Moisture and light lead to mold (ew) and sprouting (annoying, though not a deal-breaker), so stow your storage onions (red, yellow, and white as well as shallots and the diminutive pearl and cippoline) in a dry, well-ventilated basket, bin, or large bowl.

Onions and potatoes store best in a similar environment: a cool, dry place. And both like to have a ventilated container, like a paper bag, basket or open bin.

A standard storage box can hold up to 1,000 kg of onions or up to 1,250 kg of potatoes.