We have a place nearby where they used to grow them to sell cut. Probably 10 years ago or more, and they still show up each year, with no protection at all, out in the field. I put a bale of straw over mine each year, and they come back fine. I don't know if they are as full and pretty as when you first purchase them, though.
I knew crocosmia was in the glad family, but I just dug some and was surprised that they grew exactly the same, with corms on top of one another.
