Ginger dries out quickly in the fridge because it's typically stored improperly, leading to moisture loss. The cool, dry environment of a refrigerator draws moisture out of the ginger root.
Ginger, like many fresh produce items, contains a significant amount of water. When exposed to the refrigerator's environment, this water evaporates. The refrigerator's cooling system is designed to remove moisture to prevent spoilage of other foods. This process, while beneficial for most items, is detrimental to ginger. Without proper protection, the ginger's outer layers will dry out, becoming wrinkled and tough. The inside can also become fibrous and less flavorful. To prevent this, you need to create a barrier that traps moisture around the ginger. This can be achieved through several methods, such as wrapping it tightly in plastic wrap, storing it in an airtight container, or submerging it in water. These methods help maintain the ginger's moisture content and prevent it from drying out.
Store ginger in a resealable plastic bag with all the air squeezed out, or wrap it tightly in plastic wrap. For even better results, place the wrapped ginger in the crisper drawer of your refrigerator, which typically has higher humidity.