 The tree performed particularly well in the Northern Arizona University trials where, along with 'Frontier', it proved very tolerant of the hot and arid conditions in the eastern part of Arizona, exhibiting minimal leaf scorch.In Europe, 'Regal' was introduced by the now-defunct Conrad-Appel nursery in Darmstadt and grown under licence by several Dutch and German nurseries as one of the Resista series .It has enjoyed modest success in Germany as a street tree , but remains uncommon in the UK, where it was introduced by the Conservation Foundation and marketed for a few years by Crowder's Nursery, near Lincoln.