Genus Azalea Species hybrida Cultivar 'RLH13P3' Bloom-A-ThonÂ® White Common Name Bloom-A-ThonÂ® White Azalea Patent ID 21512 Height 2.5 to 3 Feet Spread 2.5 to 3 Feet Habit Compact, mounding habit. Slow to moderate growth rate. Zone 6 to 9 Culture Full sun to partial shade. Flower White flowers in April, then again in summer, and again in fall. Flower Color White Foliage Medium green foliage, evergreen. Categories: Azalea Evergreen Shrub Proven Winners® Color Choice® Description Photo courtesy of Proven Winners.