Colocasia "Pink China" appears to be the most cold-hardy elephant ear. It can survive the winter in zone 6 if you cover the ground with mulch to give it some protection. All the other elephat ears should be able to grow in zone 6 as well, but you'll have to dig up the tuber in the fall and store it indoors, since otherwise it will freeze during the winter. Here's how to overwinter them:
Answered on January 26, 2018
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