Thanks for all the information Kristi! I've never frozen it and wondered how successful that would be. I know the fresh "palm" leaves can be brewed for tea and also used in stir fry, although I've never tried either.
Someone gave me a horseradish plant and I thought I knew where I'd planted it. I couldn't find it months later, and figured it had died of neglect. I had forgotten about it until now. It's another of those plants I use so seldom, but would be great to grow. I haven't looked for it in the grocery, but will now that you've jogged my memory.