Japanese Tree Lilac 'Ivory Silk' - Syringa reticulata 'Ivory Silk' | Wirebasket Shrub-Small Tree // ABTreesCommonly known as Japanese tree lilac, grows as a small tree or large shrub with an oval rounded crown. Blooms later than most other lilacs with showy, fragrant, creamy white flowers bloom in upright panicles late May to early June. Flowers give way to clusters of brown capsules that persist into winter. Attractive reddish brown peeling bark on younger branches, turning gray with age. 'Ivory Silk' is a small tree or large shrub with a rounded crown,