Buy from a farmers' market, and ask. Most of the sellers will know off the top of their heads exactly how their crops have been grown and what was/wasn't used, and if they don't, that's a seller to avoid.
As an added bonus, farmers' markets tend to be cheaper than supermarkets even as the food is better. It mystifies me that they aren't more commonly used and have a reputation as being for rich hipsters (i.e., like Whole Foods).
As an added bonus, farmers' markets tend to be cheaper than supermarkets even as the food is better. It mystifies me that they aren't more commonly used and have a reputation as being for rich hipsters (i.e., like Whole Foods).