Mine go in a storage cellar along with my canned goods and all my other summer bulbs. I've never had a problem with them rotting but some of them have only bloomed once. Usually I put them in a box, roots and all, packed in together and if I don't get to them early enough the ones that are going to bloom are already setting out buds. I just wonder, if I let the roots die back, more of them will bloom but I will probably take them down to storage shortly regardless because we're needing both sides of the garage and there isn't anywhere else to lay them out.
Thanks for all your help!