The cranberry bogs are flooded with 6 to 8 inches of water so the Water Pick Tractors can drive through and separate the berries from the vine. These tractors have agitating, spinning rollers on the front that graze the vines, causing the cranberries to be released. Cranberries float because the interior seed cavity has a hollow area. The bogs are then flooded to a depth of approximately two feet so they can be corralled by a floating boom. The cranberry has now grown to its ripest, fullest state and is ready for its journey to you.