Originally Posted by
Eastbay1K
This is particularly an issue with the Costco packages. My theory (as this often occurs prior to the use-by date) is that these items have frequently been subjected to sub-freezing temps at points during transport/storage and the thaw makes those more tender leaves rot almost immediately.
I have a friend who owns blueberry farms (plantations?). He told me that shelf life can range from 7-30 days, and that the key to hitting the upper end of that is maintaining a relatively constant temperature throughout the supply chain (i.e. cold and cool are both fine, but you shouldn't switch between them).