I've tried and tried cultivating horse radish this year. most of it was available during the fall.
I planted a few in deep containers, one each.
their leaves disappeared and i guess they died.
is there a particular horse radish predator that I need to know about?
Certified GKH Gardening Expert
You would be best off planting it in the spring and that will give it a chance to get a good hold before the cold weather sets in. That being said, it is best to wait at least 2 years before harvesting horseradish as this gives it a good chance to establish itself.
Make sure that in containers when you plant it, you keep it well watered. As soon as the top of the soil feels dry, it needs to be watered. In hot weather (80F or higher) you may need to water everyday.