Magnolias are inextricably associated with the Southern United States. The definitely do not grow in Mesa or anyplace in Southern Arizona. These large beautiful flowers would fry in an instant. I have seen large specimens growing as far north as Utah Valley in Central Utah and in Northern California. Unfortunately, I would classify these plants as large messy trees and not something I would plant in my own yard. But that doesn't stop me from admiring them in places where I do not have to rake up what falls.