Raspberries Become Mushy Under Wet Conditions Raspberries are extremely sensitive to moisture and are therefore delicate. Once plucked, raspberries, like blueberries, do not continue to ripen. "If they are harvested too early, they will not get sweeter, only darker in color and start to mold if they are in moist conditions
The Ideal Method for Preserving Raspberries Proper storage is one of the simplest methods to prevent your raspberries from becoming too mushy too quickly. "Put your raspberries in the refrigerator as soon as you get home," Bocock advises. "Keep them there until you’re ready to eat them."
When to Wash Raspberries To have everything ready to eat when I want to, I prefer to wash and prep my produce when I get home. The exception is raspberries, which can become mushy when wet.
"Wait until you’re ready to eat them to wash them, as excess moisture can cause them to go mushy faster
Wash them as you go if you're not sure you'll finish the entire container. "We recommend washing them in smaller handfuls so the portion you are saving for later doesn’t get wet and will last longer in the fridge