Hydrangea petiolaris (climbing hydrangea), is a species of flowering plant in the family Hydrangeaceae native to Asia
The plant is a vigorous woody climbing vine plant, growing to 30 to 50 ft (9 to 15 m) height and 5 to 6 ft (2 to 2 m) wide. It grows up trees and rock faces, climbing by means of small aerial roots on the stems
The leaves are deciduous, ovate, 4–11 cm long and 3–8 cm broad, with a heart-shaped base, coarsely serrated margin and acute apex
The flowers are produced in flat corymbs 15–25 cm diameter in mid-summer; each corymb includes a small number of peripheral sterile white flowers 2.5–4.5 cm across, and numerous small, off-white fertile flowers 1–2 mm diameter
The fruit is a dry urn-shaped capsule 3–5 mm diameter containing several small winged seeds
Hydrangea petiolaris is cultivated as an ornamental plant but is also grown either on masonry walls or on sturdy trellises or fences and can also be grown as a ground cover
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