Persian Lilac. 6 x 4. A graceful arching flowering shrub. The pale violet to lavender flowers of the Persian Lilac shrubs are very fragrant. The 2 to 3 inch long blooms appear in late spring and bloom abundantly into early summer, attracting bees, butterflies and birds. The rounded and low mature shrub form makes the Persian lilac a perfect plant to be used in a foundation planting or as a border plant.