A "must-see" for horticulturists and all "non–desert dwellers", this "unique" "botanical treasure" situated "smack in the middle" of Phoenix "captures the beauty of AZ's natural settings" and illustrates the "diversity and complexity" of the Sonoran Desert through its "exceptional collection"; insiders advise taking the docent tour and checking out the "fabulous butterfly pavilion" (check for seasonal hours) aflutter with hundreds of winged beauties.