Whether made from scratch or plopped out of a can, your cranberry sauce started in a bog like the one seen here. Cranberry shrubs are planted in beds surrounded by dikes. Once the fruit ripens in the fall, the beds are flooded with water, creating bogs full of submerged shrubs. A harvester machine dislodges the berries, which float to the top of the water. Then they"re easily corralled on the surface with flexible booms.