Alleghany viburnum (Viburnum rhytidophylloides Alleghany), sometimes spelled Allegheny, is a semi-evergreen shrub with a moderate growth rate and multi-stemmed, upright form. Growing 8 to 10 feet tall and wide, Alleghany viburnum has dark green, leather-like foliage that is wrinkled. Growing up to 6 inches long, the leaves of Alleghany viburnum turn a dark green to brown in fall. Emerging in spring, the white flat-topped, 4-inch wide flowers appear to light up the bush with color and texture. Versatile, Alleghany viburnum grows in a wide range of soil varieties, including dry and compacted soils. Drought- and heat-tolerant, Alleghany viburnum prefers moist, soil and full sun, and is hardy in zones 4 to 8.
Prune spring-flowering Alleghany viburnum after flowering, when most of the blooms have shed. Use sharp pruning shears to ensure a smooth and precise cut.
Cut back the Alleghany viburnum with cuts up to 1/2 inches in diameter. Remove all weak, gnarled and crossing branches by removing the entire branch from its point of origin.
Trim all disease- or pest-infected branches by cutting of the whole branch, ensuring the Alleghany shrub is not infected in its entirety.
Pinch off dead or spent blooms by cutting off the bloom. Removing the old and withered bloom helps send needed nutrients to other areas of the shrub.
Remove all suckers, or shoots arising from the base of the Alleghany shrub, as soon as they are visible.
Open up mature Alleghany viburnum shrubs by trimming the center growth and cutting back all terminal branches to the outwardly facing bud.