"Onions naturally emit ethylene, a gas that essentially makes produce ripen much faster. As a result, the obedient potatoes oblige. They begin to sprout and turn green, potentially exposing you to solanine, a toxic compound that can cause serious digestive issues, according to Healthline. That said, onions aren't safe from potatoes, either: They can be affected by the moisture that comes off potatoes in storage, eventually turning them soft and moldy."
"For one, they're both essential items to keep handy, and they also need a similar type of storage. Simply put, both vegetables need to be stored in a dark place because light causes them to ripen faster. That's especially crucial for potatoes, as the production of solanine is directly connected to light exposure. The storage should also be cold and dry, since heat and moisture are a recipe for mold."
Onions emit ethylene gas that speeds ripening and causes nearby potatoes to sprout and turn green, increasing solanine levels that can cause digestive problems. Potatoes release moisture in storage that can soften onions and promote mold growth. Both vegetables require dark, cool, dry storage to slow ripening and prevent mold; light exposure especially increases solanine production in potatoes. Larger quantities benefit from a root cellar that protects from light, heat, and humidity. In a home pantry, keep onions and potatoes separated and stored in appropriate dark, cool, dry conditions to extend shelf life and avoid mutual spoilage.
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