Hydrangea seemanii are an evergreen climber that comes from the Mountains of Mexico. Hardy.
Pruning Hydrangea seemanii
Climbing Hydrangeas need the flowers removing after flowering and can be cut back hard in the spring to reduce the size of the plant, however it probably won't flower very well in this season.
Evergreen climber with dark green leathery leaves when established has large very pretty creamy white lacecap flowers.