I have a fairly young snowball viburnum that is about 5 to 6 feet tall and has a lot of nice blooms. There are two branches that start near the base and reach up 2 about 7 to 8 feet tall. They are straight with minimal branching and no blooms. I could not see that they sprouted so low that there blow a grafting scar but they are two of the lowest branches on the trunk of the shrub. I am wondering whether this is the nature of the growth of the snowball viburnum or if these are suckers that need to be pruned off.