any one grow calla lilies in the north?

[RosieC]

My Mum grows them here in the UK. She has them in the ground beside her pond and they overwinter in the frozen ground. Not sure just how cold it gets where you are, but we expect snow several times a winter and ice/frost most winter mornings. Where my Mum is they are in a more exposed area that gets colder weather than I get in the town.

Anyway, she has quite a large clump of them and the clump as a whole seems to always have something living to come back up the next year.