Doublefile Viburnum ShrubsDoublefile Viburnum Shrubs for Sale Online Doublefile Viburnum Shrubs (mariesii) are truly a breathtaking shrub when in bloom. Clothed in snowy white flowers in a pinwheel arrangement atop the branches in spring as if covered in snow, with attractive horizontal branching and good fall color, making it a fantastic specimen shrub. Works great with taller trees and shrubs. Wide growing shrub. Blooms in late spring. Great for firescaping.