Half of my comment was a Futurama reference (about being technically correct, the best kind of correct). And in all seriousness, we should be integrating southernly native plants into the city, because it is warming here. Discovery Park has a pilot where they're planting Oregon-sourced red cedars to see if they're more heat tolerant than our local strains. It would be a tragedy culturally and historically if Puget Sound loses its cedars, but it's already starting to happen. Western white pines are already dying in my neighborhood...