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Keeping this in view, can you freeze blackberries?
Freeze the berries overnight. When they are frozen, they should easily lift off the parchment paper. Transfer the frozen blackberries into Ziploc freezer bags. If they are frozen properly (keeping as much air and moisture out as possible), blackberries should stay good for up to 1 year in the freezer.
Hereof, do you wash berries before you freeze them?
Don't worry about rinsing the berries before you freeze them; simply place them, still in their original containers, in resealable plastic bags and store them on your freezer shelf. If you didn't wash your blueberries before freezing them, rinse them just before use.
about 10 to 12 months