Speaking of viburnums, here is another popular variety that is truly a traffic stopper. Chinese Snowball (Viburnum macrocephalum) features the big pom-pom type blooms that start out pale green and mature to sparkling snow white. It is a fast grower and will attain great heights in only a few years. This shrub is about twelve years old and towers about 12 feet. I've started pruning it since most of the blooms are appearing near the top but I've yet to find clear instructions on how best to do this. I plan to reduce some of the older limbs this year after the blooms fade.
Apparently this was once hard to locate in nurseries. I've received countless e-mails inquiring where to buy it but those are dwindling now so perhaps they are now easier to find.