Mountain Hydrangeas prefer consistently moist soil, especially during hot weather. Water deeply when the top inch of soil feels dry. Avoid waterlogged conditions, which can lead to root rot.

Regular watering promotes healthy foliage and abundant blooms. Mulching can help retain soil moisture.

Prune Mountain Hydrangeas immediately after flowering, typically in late summer. As they bloom on old wood, pruning in spring will remove flower buds. Remove dead, damaged, or crossing stems.

Thin out overcrowded branches to improve air circulation and encourage stronger growth next season.

Mountain Hydrangeas can be propagated by taking stem cuttings in early summer. Select healthy, non-flowering shoots, cut them below a leaf node, and dip the cut end in rooting hormone.

Insert cuttings into a moist potting mix and cover with a plastic bag to maintain humidity. Roots usually form within 4-6 weeks.

Repot container-grown Mountain Hydrangeas every 2-3 years or when they become root-bound. Choose a pot that is slightly larger than the current one. Use a well-draining potting mix.

Repot in early spring before new growth begins. Water thoroughly after repotting.