Hydrangea petiolaris is an elegant climbing hydrangea perfect for cold north45facing walls that rarely see the sun this shade45loving hydrangea bears lacy white blooms in summer providing a beautiful contrast to its cloak of dark green foliage these heart45shaped leaves turn buttery yellow as autumn approaches brightening even the darkest corner once established this superb rhs agm variety quickly scales walls and fences with its clinging aerial roots although it can be a litt