Genus Azalea Species x Cultivar 'Northern Hi-Lights' Common Name Northern Hi-Lights Deciduous Azalea Patent ID Height 4 to 5 Feet Spread 4 to 5 Feet Habit Large, rounded shrub. Moderate growth rate. Zone 4 to 8 Culture Full sun to partial shade. Flower Creamy white flowers with yellow blotch on upper petals. Heavy bloomer, May. Flower Color White Foliage Medium to dark green. Deciduous. Categories: Azalea Deciduous Shrub Description The ‘Northern Lights’ series was developed at the University of Minnesota for extreme cold hardiness and excellent flowering.