Blackberries are a food item found in the Woodland village.
They become available at Level 4, and unlocking them takes 8 hours.
At the beginning of August 2016, the location of the Blackberry bush moved. It was originally slightly south of the Mushrooms, but this caused conflicts with the Village of Oz quest, and The Village Games.
The Blackberry bush is now located beside the Monkey's hut. This appears to be a permanent move, since it has been rolled out to games where the Village Games event is not occurring.