Water Viburnum sargentii regularly, especially during dry periods. Ensure the soil remains consistently moist but not waterlogged. Deep watering encourages a strong root system.

Reduce watering in autumn as the plant enters dormancy.

Prune after flowering in late spring or early summer to maintain shape and remove any dead, damaged, or crossing branches. Avoid heavy pruning in autumn or winter, as this can remove flower buds that form on old wood.

Propagate Viburnum sargentii from softwood cuttings taken in early summer or semi-hardwood cuttings in late summer. Layering is also effective.

Seed propagation is possible but may result in variations from the parent plant.

Repotting is generally not necessary for established landscape plants. For container-grown specimens, repot every 2-3 years in spring, moving to a slightly larger container with fresh, well-draining potting mix.