Water Viburnum glomeratum regularly, especially during dry periods, ensuring the soil remains consistently moist but not waterlogged. Allow the top few centimeters of soil to dry out slightly between waterings.

Reduce watering in cooler months when the plant's growth slows down.

Prune Viburnum glomeratum immediately after flowering to maintain shape and encourage bushier growth. Remove any dead, diseased, or crossing branches.

Light annual pruning is usually sufficient; heavy pruning can reduce flowering the following year.

Propagate Viburnum glomeratum from semi-hardwood cuttings taken in summer. Insert cuttings into a moist, well-draining rooting medium. Alternatively, seeds can be sown in autumn, but germination may be slow and erratic.

Repot Viburnum glomeratum if it becomes root-bound, typically every 2-3 years. Use a slightly larger pot with a good quality, well-draining potting mix. Repot in early spring before new growth begins.