How to Prune Japanese hydrangea vine?
Routine pruning is unnecessary; shorten overlong shoots to fit the available space. Prune in spring.

Japanese hydrangea vine · Hydrangea hydrangeoides
Also known as: climbing hydrangea
Grow against a wall, fence or into a large tree. Self clinging, it will attach itself to surfaces by aerial roots. Though shade tolerant, it flowers best in a sunny situation. Plant 60cm (2ft) from support and tie in until established
Routine pruning is unnecessary; shorten overlong shoots to fit the available space. Prune in spring.