Antonius,
Too bad about the religious prohibition, squirrels are not only edible but quite tasty:-)
I've found blood meal to be only stinky for a day or so, but then again, after it wasn't stinky it didn't seem to do anything to deter the rabbits that were devastating the particular garden I tried it on....neither did our dog at the time:-)
Is your horseradish question answered? I find that horseradish, wrapped well in cling plastic, keeps forever in the fridge. Your inquiry reminded me that I had purchased some well over a month ago, and lo and behold, it is ensconsed at the bottom of the crisper drawer, just fine.
I would think that if it requires heavy mulching (which is probably to render it diggable rather than to protect it from freezing) in the ground, then it would be in some jeopardy in a pot.
Another hazard would be the freezing/thawing that a potted specimen would be subject to, as opposed to one in the ground, which stays frozen until spring.