Trachycarpus fortunei (windmill palm) can handle more extreme cold than a lot of the typical landscaping here. There are some growing in Bulgaria that have survived temperatures down to -17F. My palms breezed through the coldest day in decades this past January (average temperature 14F with brutal winds). In contrast several of our rhododendrons were freeze-dried to a crisp and might not survive. The remaining cordylines in the area were wiped out to the ground, but most were wiped out in previous years as they have hard 18F tolerance range. I've also noticed some very large eucalyptus trees that look completely dead, some in various precarious spots near the road.