When choosing blueberries look for those that are larger and round with a deep blue-purple or blue-gray color; a reddish hue indicates they're not yet ripe.
On the other end of the spectrum, overripe blueberries, like raspberries, will stain or dampen their carton.
Perfectly ripe blueberries will have what is called a "waxy bloom" - a frosty look that indicates a fine, tasty berry.
Temperatures between 34F and 38F are best.
Moisture will hasten decay of your blueberries, so keep them dry in storage.
Under ideal conditions, blueberries should keep for 5-7 days in your refrigerator.
For best results, consume your blueberries as soon after purchase as possible.
If you plan to freeze your blueberries for jams and jellies, remember not to wash your berries before freezing. Washing, prior to freezing, will make the skin tougher. Pack berries into freezable containers, or freeze them on a tray and then pack them into containers as soon as they are frozen. Seal the container and keep frozen until you are ready to use them. Be sure to wash the thawed blueberries prior to use.