Whole: You can store the whole (unpeeled) root for up to 2 weeks, wrapped loosely in the fridge. Alternatively, you can freeze the root for up to 6 months tightly wrapped in cling film. It will become less firm upon thawing. I tend to grate it directly from frozen with a micro plane grater. Cut: Once you start using the root, wrap it tightly or store it in an airtight Ziplock bag and use it within 7-10 days.