Hydrangea barbara prefers consistently moist soil. Water deeply when the top 2-3 cm of soil feels dry. Avoid waterlogged conditions, which can lead to root rot.

In hot weather, more frequent watering may be necessary to maintain optimal moisture levels.

Prune Hydrangea barbara after flowering, typically in late summer or early autumn. Remove dead, damaged, or crossing branches. To encourage more blooms, you can lightly prune back stems that have finished flowering.

Avoid heavy pruning in spring, as this can remove the current season's flower buds.

Propagate Hydrangea barbara from softwood cuttings taken in late spring or early summer. Select healthy, non-flowering shoots, cut them below a node, and remove lower leaves.

Dip the cut end in rooting hormone and plant in a moist, well-draining potting mix. Keep humid and warm for rooting.

Repot young Hydrangea barbara plants every 1-2 years, or when they become root-bound. Use a larger pot with fresh, well-draining potting soil. The best time to repot is in early spring before new growth begins.

Ensure the new pot has adequate drainage holes.