Japanese Holly Fern

This is the first winter for my Japanese Holly fern .. some sites have it zoned differently like this one http://www.fernlea.com/fabulousferns/variety/holly.html .. it says zone 6 .. but on its info tag it was 4 .. what ever happens , happens ! .. I have other higher zone plants in my garden .. we all know about micro-climates we can establish with cross fingers .. so hopefully this will hold true too !