New rule 80pc don't know means potatoes can last three times longerThere is an additional method using a common fruit that also helpsView Image Potatoes are among the most binned food in the countryThe country is braced for another heatwave with temperatures forecast to top 30C again, and experts say that means you should make a change with your potatoes. ‌For generations, the advice has been to keep potatoes in a dark cupboard, but that guidance is now out of date. The latest research shows potatoes actually last up to three times longer when stored in the fridge rather than a cupboard, yet 80 per cent of people are unaware of the switch. Consumer expert Kate Hardcastle added: “When household budgets are under pressure, consumers often assume saving money means making big sacrifices. That worry has since been debunked, and modern research confirms fridge storage is safe, making it one of the simplest ways to keep potatoes at their best for longer this summer.