The best way to store fresh ginger is to place the unpeeled root in a plastic bag, press out excess air before sealing the bag, and then store the bag in the refrigerator's crisper. If the root is cut or peeled, cooks must blot the ginger dry before storing it.
Ginger preserves well for several weeks if the piece is firm and smooth when purchased, while soft pieces and those with excess wrinkles don't last long. Ginger also stores well in the freezer for up to six months, using the same storage techniques. Cooks can grate frozen ginger without thawing it.