Climbing Hydrangea Hydrangea anomala subsp. petiolaris - Hardy plantThis gorgeous climbing hydrangea will grow where other climbers struggle! It flowers with wonderful big flower heads in the summer. Hydrangea anomala subsp. petiolaris requires little or no maintenance and is easily trained. Ideal and looks fabulous at your front door or up against the shed or fencing. It will actually sprawl across the ground too if not trained to climb up something.