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We checked with several stateWe checked with several state extension services and a plum advisory board to confirm that yes indeed, 31 to 32 degrees is the optimum temperature for storing fresh plums. Relative humidity of 90%-95% is also advised.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?