Autumn/ Winter is the best time to harvest.
Growing in a container is an excellent method. If you have managed to kill
it please let us know how you managed it!!
Best Wishes Brian.
"Sarah Dale" wrote in message
...
Hi All,

I've had a horseradish plant in a big pot buried in the ground for the
last
couple of years. When is the best time to harvest?

I may have to de-pot it son, because there are no signs of regrowth from
it
yet this year, and I'm wondering if it is dead, or has just had the young
top growth slugged.....

TIA,
Sarah