On a bulb email list, we have had an active discussion of
hardy callas (Zantedeschia). No one in the US in Zone 5-6 has had
success with Z. aethiopica outdoors, although the closely related cv
'Green Goddess' does much better. A German grower does better with
the species grown under water all year, but this is less successful
in the US. This has raised questions.
Do any of our Aroid specialists have any comments on
hardiness of Zantedeschia in Zone 6, Zone 4 of colder?
Thanks Jim W.
Dr. James W. Waddick
8871 NW Brostrom Rd.
Kansas City Missouri 64152-2711
Zone 5 Record low -23F
Summer 100F +