Not all viburnums have a scent when in bloom but those that do are long-remembered. Korean Spice Viburnum, Viburnum carlesii, is one with lots of fragrance. It's hardy in Zones 5 through 9, with ...
carlessii. The first, also called Judd’s viburnum, has semi-snowball bloom clusters that are pink in bud and white when open. It grows in full sun or part shade, as does Korean spice viburnum (V.