How to Select a Plum
Select a plum that has smooth skin and is free of blemishes, wrinkles, and soft spots. A grey sheen on the skin of the plum is called bloom and is an indication that the fruit has not been handled too much between tree to distributor, it does not affect quality. Plums come in a wide range of colors so it is difficult to judge ripeness based on color alone. Plums that are hard are not yet ripe, ripe plums will be firm but give slightly when gently squeezed. Avoid plums that are soft.
How to Store Plums
Ripe plums should be stored in the refrigerator in a plastic bag for up to 5 days.
How to Freeze Plums
Wash, peel, half and pit the plums. Cut the plums into slices or pieces if desired and place them in a single layer on a baking sheet. Place the baking sheets in the freezer until the plums are frozen. Once frozen, put the plum pieces in freezer containers and store in the freezer.
How to Ripen Plums
To ripen plums that are too hard and tart, you can simply place them on the counter at room temperature and wait. Or, you can place them in a brown paper bag and fold the top closed. Store the bag at room temperature and the ethylene gas produced by the fruit will hasten the ripening process. To speed the process further, add an apple or banana to the bag. Daily check the plums for ripeness. Once they have reached the desired ripeness, store them in the refrigerator.