Buddleia davidii Orange-Eye Butterflybush Size: 5 to 10' high and wide. Hardiness: Zones 5 to 9. Heat Zones: 7 to 1. Habit: Rounded-arching with long, slender branches. 4- to 10-in.-long leaves vary from gray-green to dark green above and are silver and pubescent beneath. Blooms from June and July to fall. Culture: Full Sun to light shade.