Thanks Canadianplant. Sorry I get really defensive because I continually have to put up with people from other provinces coming here and asking me how I live with -40s all the time. I've never experienced colder than -37 and that was the coldest its been in the city my whole life. Of course the international hits -40 every year. Most years its -27 to -33 as a low in the city. Even when its only -29c as a low in the city, it still breaks -40 at the international. Its somehow colder there, than fort mcmurray most of the time???!!! Either way, I love my city and would rather have people see the temperatures I have to live with day to day. There are many amazing mature trees in the city that are rated zone 4 and 5 that would not be living here if it was zone 2 or even borderline zone 3. Yes it is the urban heat island effect, but the airport is the rural arctic impossible freeze effect. I will post a picture of the palm at the end of the growing season to see how far its made it. My new trees this year are the sweetgum and london plane tree. My northern pin oak has been in the ground 3 years in an extremely exposed wind position with no protection and looks amazing. Theres one example of a tree that would not be alive if we were hitting below -40.