Strawberries and blueberries , after being picked, can last only up to about 3 days. They are all imported from other countries to here. So when they appear in supermarkets here, they are at least a couple of weeks away from the times they were picked. To keep them looking good, lots and lots of chemical preservatives had to be applied. And such preservatives are cancer-inducing. Hope China mainland can find ways to grow them, so they can arrive in supermarkets here without cancer-inducing preservatives.
