Tesco has confirmed that potatoes can last up to six months longer without sprouting if stored correctly. The supermarket giant advises swapping the plastic bag potatoes are often sold in for a paper or mesh bag, and keeping them in a cool, dark place below 10°C, away from other vegetables such as onions.
Why Potatoes Sprout and How to Prevent It
Potatoes naturally begin to sprout, shrivel, and soften within a couple of weeks if stored improperly. According to Tesco, the key factors are air circulation, temperature, and isolation from ethylene-producing produce. Ethylene gas, released by onions and other fruits, accelerates ripening and sprouting.
Tesco states: "Your spuds need air circulation, so don't suffocate them in a plastic bag. They're best kept in a mesh or paper bag. It's also crucial that potatoes are stored away from other fresh produce, particularly onions, as they release ethylene gas."
Optimal Storage Conditions
Potatoes must be kept in a dark place because light triggers photosynthesis, leading to sprouting. The ideal temperature is below 10°C. Suitable locations include a porch cupboard, garden shed, or even the fridge if space allows. Before storing, Tesco recommends a "curing" process: brush off dirt (do not wash, as moisture encourages sprouting), place potatoes on newspaper in a dark spot without touching each other, and leave for two weeks to toughen the skins.
After curing, transfer the potatoes to a paper or mesh bag and store in the chosen cool, dark location. This method can keep potatoes "as fresh as the day you bought them" for up to six months, according to Tesco.
Additional Tips
- Avoid storing potatoes near onions or other ethylene-producing fruits and vegetables.
- Do not wash potatoes before storage; brush off excess dirt only.
- Ensure potatoes are not touching during the curing phase to allow air circulation.
By following these simple steps, households can significantly reduce food waste and enjoy fresh potatoes for months.
