Endless summer Hydrangea?

I've been reading on a Canadian Forum that I should cover it during
the winter with Oak or Willow leaves, or plastic bubble wrap.  I'm
just wondering if anybody in the St. John's area has left it uncovered
during the winter or just protected it from snow with a burlap cover
and had it come back the next year?

My mother has 2 hydrangeas, neither Endless Summer though, and has
never covered them and they are doing very well....