We need a little more information, guest. Were they new this year, for example.

And if not, were they badly damaged by the winter. Watering, exposure, and feeding information would be helpful, too.

We can't grow them outdoors in the UK, Tug. The only hardy one is Z. aethiopica 'Crowborough'.

Ah! I was curious about that. So many of the people asking about callas have phrased their questions as if they were in the ground. Apparently I have assumed too much!

I'm afraid so. Frost kills the rest....I put mine in the greenhouse as soon as the temps drop. The hardy one's on the stream bank.