Zantdeschia hardiness
Alberto Castillo (Sun, 14 Jun 2009 12:41:05 PDT)
In Britain they grow exra hardy clones, obtained from colder areas in the wild. 'Crowborough' is very well known.
Z. aethopica is a marsh plant in the mild original habitat of the Cape and goes dormant in summer. True that in a WARM climate they remain evergreen if kept on well watered.
British garden books (the main kind we used to have) recommend
growing it as a shallow aquatic to enhance its winter-hardiness. I
sometimes see other callas offered as water-garden plants, but as far
as I know none of them is winter-hardy here in Zone 7 or 8, or
whatever we choose to number it."
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