Hydrangea petiolaris flowers in summer producing lacy white blooms that contrast stunningly with its abundant dark green foliage when summer turns to autumn the heart shaped leaves transform into a buttery shade of yellow that will illuminate even the darkest corner this shade loving hydrangea is ideal for cold north facing walls that seldom see the sun this variety is the holder of an rhs agm and despite being slightly slow to get going it will quickly climb fences and walls with its cli