White Lilacs Zones 3-7 Taller than its cousins, the White Lilac bush ranges in size from 8-10 feet tall. Like other lilac bushes, the White Lilac requires sun and air circulation in abundance in order to reach full maturity and potential.  Width: 6-7 ft.   Sunlight: Full Sun   Blooms: Spring   Spacing: 3-4 ft. @katerinamaslaro