any one grow calla lilies in the north?

[johnblagg]

Having bought several calla lilies over the years I decided to leave some outside one year .....to my surprise they are tougher than I thought and seveal came back ...a white a yellow several pink and one red orange.....

To my surprise they make seed often and....even greater surprise the seedlings survived many years and reached blooming size....they produced seed as well and I began saving seed from the survivors....I now am into the 4th generation of seedlings from the survivors and they seem tougher every year.This year I left one batch in a shallow pot on the porch and just last week decied to check and see how they have done with no mulch and actually having been frozen solid in the pot ....

I had 5 or 6 that after warming up were mush and 12 solid with green eyes ready to grow good bulbs.....

LOL long ramble to ask if anyone gets these to overwinter in cold areas besides me?