Tri-Lights Exbury Type AzaleaAnother of the fabulous Northern Lights series of deciduous Exbury type azaleas. The azaleas in this series were bred by the University of Minnesota Landscape Arboretum to be very hardy and to have flower buds that can withstand temperatures of 30 to 45 degrees F. They may be grown in Zone 3 with protection. 'Tri Lights' has deep rose buds that open to wavy edged flowers that are soft pink with white overtones and a yellow blotch. It grows 4 to 5 ft.