Hydrangea petiolaris is a vigorous, deciduous self clinging climber.
The aerial shoots allow it to climb without any other support over trellis and over trees and shrubs, if you want it to climb up a wall it will require additional support.
It has oval leaves that turn yellow in autumn and have finely serrated margins. In summer it bears masses of domed flower clusters. The clusters are a mix of flattened white sterile and fertile flowers and smaller infertile flowers.
In hotter climates keep in total shade or the flowers and leaves will scorch.