'Popcorn' Doublefile Viburnum produces large quantities of big white snowball blooms in April. The sterile flowers start lime green before maturing to white, and make a stunning show for a month. The habit is upright and somewhat compact. Introduced by David Leach of Ohio, and Dr. Michael Dirr's favorite of the Snowball Doublefile Viburnums. Deciduous, with dark green leathery foliage which stands up to heat better than many of its cousins.