Posted: 02/11/2014 at 17:35
Frankly I find it's easier to buy a large section of rhizome in the supermarket and keep it in the freezer! You can grate it from frozen and return the rest to the freezer.
It is of interest to grow it but not very practical to rely on if you have to dig it up to use it. Bring it into somewhere frost-free and light and you will be able to keep it going for years as a house-plant.