I was debating chucking it in the freezer (which is a really most excellent way to store ginger), I noticed a wee green shoot, and rather than freeze, I decided to observe in the name of Science!
Now a month after purchase, we have:
betty the woven goanna’s tail to the left of the shot, not a strange grey, furry growth
I blame the heat and humidity for the rapid growth. According to the InformationSuperhighway it can be planted and harvested in a year or two. Harvesting is unlikely, but I’m intrigued to see what happens. Hopefully this does not go the way of the last experiment