Genus Azalea Species hybrida Cultivar 'Hardy Gardenia' Common Name Hardy Gardenia Azalea Patent ID Height 3 to 4 Feet Spread 3 to 4 Feet Habit Compact, rounded shrub. Evergreen. Zone 7 to 9 Culture Full sun to partial shade. Flower 2 1/2", double white blooms. Blooms mid to late spring and again in late September. Flower Color White Foliage Dark green, evergreen. Categories: Azalea Evergreen Shrub Description Part of the Bloomin’ Again Series. Blooms spring and again in the fall.