I was told last year by an experienced grower to put in in the fridge in
a sealed plastic bag in the crisper drawer for its winter rest(if the
bag isn't opaque, put then cover it or put the whole thing, bag and all,
in a paper bag to keep the light out). It should have been recently
watered and should not have any foliage left. If it's an acaule or other
acid-lover, the pure (RO or rain) water you used to water it with should
have had 1TBS/GAL of white vinegar in it.

Good luck!