Typical commercial Zantedeschia aethiopica has not been a success outside here in Maryland, either. Nor have plants received as 'Crowborough'. I've tried the pond method which Jamie mentions: that has not worked here, either. 'Green Goddess' has not yet been tried. Jim McKenney Montgomery County, Maryland, USA, USDA where the local ecological aroid equivalent of Zantedeschia aethiopica, Peltandra virginica, is now in bloom.