I agree it is beautiful but alas it is not my own garden. The garden belongs to Spencer Barrett of the University of Toronto.
Check this link to find the contact email for Mr Barrett; if you attach the photo to an email he may offer more assistance:
http://www.bgci.org/garden.php...
Rather than looking for plants that thrive in Canada, why not search gardens in your climate zone. You may find some new favorites that will be happy in Arizona. Here is a list of botanic gardens in Arizona; maybe some of them are close enough to your location that you might visit in person.
[url=tp://www.bgci.org/garden_search.php?action=Find&ftrCountry=US&ftrKeyword=arizona&x=97&y=12]tp://www.bgci.org/garden_searc...[/url]
Also, have you checked out the Southwest Gardening Forum? Lots of good folks over there!
http://garden.org/forums/view/...
