The planting distance decision is basically a tradeoff between how much you are able and willing to spend on more plants and how fast you want the hedge to fill in. The more plants you put in a given area the faster they will form a solid hedge. The less you put the longer it will take. A pretty good rule of thumb is to plant the shrubs at a distance of about 60 to 80% the mature size of the plant. This is a good middle ground range. One other factor is how fast the shrub grows. Faster growing shrubs can be planted farther apart than slow growing shrubs and still form a solid hedge in about the same time, for example.
That all said, viburnums come in many species. I suggest you look over Monrovia's online to see which suits your interests and purposes best. Also consider what zones they are adapted to. Some good ones for your area to choose from include:
SPRING BOUQUET LAURUSTINUS (Viburnum tinus 'Compactum')
ROUNDLEAF LAURUSTINUS (Viburnum tinus 'Robustum')
SHASTA VIBURNUM Viburnum plicatum tomentosum 'Shasta'
CONOY VIBURNUM Viburnum utile ?Conoy?
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