Popcorn Viburnum. If white is what you like and flowers are your love, then this is the selection for you. The proclivity with which this U. S. National Arboretum introduction flowers is unreal. The stems are lined with 2-3" "popcorn-like" flowers from head to toe. This has to be one of the most floriferous and easily grown Viburnums on the market. Grow in full sun for best bloom. It will mature in the 8-10' range, but can be easily kept much lower if that is what you would prefer. Prune at the end of flowering and one will not impede bud set for the following spring.