The temperature might - this plant is hardy in Britain, but we wouldn't get temperatures that low most of the time. It will die if the ground freezes - and at minus 15, I'd expect it would.

bury the corm deep at least 8" down and they should survive ok. the soil type as long as it is not too extreme in acidity/alkalinity or waterlogged wont make much of a difference.

Bamboo/Seaburn - being a bit cheeky muscling in here but .... I have one of these too, I set it this summer on the edge of my pond, its in quite fertile soil but I'm wondering if it will be OK now through winter after reading your comments above, as it could be a bit wet for it and we do live in a frost pocket.

It should be fine, Dawnsaunt, as long as you don't let the water freeze around it. Temperatures of -15 degrees rare as hen's teeth other here!

Thats good news Bamboo, thank you. Its grown really well so didnt want to lift it. Ha ha, hen's teeth, never heard of that one before, only the one about rocking horses.

and that should read "over" here, not other!

Dawn we always said hen's teeth too!
I have a large pot of these too and after getting badly frosted last winter it was struggling and not looking too happy at all ~but have gots lots of new leaves now~ I am thinking of either covering with a thick blanket of fleece at the first sign of any frost or maybe putting into the greenhouse on the floor~kept at about 10 degrees. Would it grow on slowly if I did?

I just want to clear something up here - Arum lily as a name can be a bit confusing - Zantedeschia aethopica "Crowborough" is the hardiest arum lily - some of the others will need protection in the winter, or bringing into a cold greenhouse, depending where you live. I'd also suggest that any Arum may well be more susceptible to cold if growing in a pot rather than the ground.

~ it is in a fairly big deep pot but yes I think protection will be supplied!

Whoo Hoo - I'm so pleased that I have the hardiest one. Thanks Bamboo