Onions have a famously long shelf life, and whole red, white, and yellow onions are easy to store—just pop them in a mesh bag or basket in a cool, dark, and dry location. You should avoid storing ...

We don't recommend storing potatoes and onions together, as onions emit a gas that accelerates potato spoilage. To prolong freshness, store them separately in cool, dry, and well-ventilated areas.