Hydrangea petiolaris produces lacy white blooms in summer, creating a stunning contrast against abundant, dark-green foliage. These heart-shape leaves transform to a buttery shade of yellow as autumn approaches, illuminating even the darkest corner of the garden. With an RHS AGM, Hydrangea petiolaris is a shade-loving Hydrangea at home on cold, north-facing walls that seldom see the sun. Despite being a slow starter, it quickly climbs fences and walls with clinging aerial roots once established. Height: 10m (32'). Spread: 3m (10').