Climbing hydrangeas are flowering deciduous vines. These plants are true climbers, using the holdfasts (suckers) on their branches to scale walls and other structures. These large plants sometimes reaching 50 feet tall or more at maturity. In early summer, they produce fragrant, lacy ("lace-cap"), flat-topped, white flower heads. These lace caps can be 5 inches or more in width and are composed of showy flowers on the outside and less-than-showy flowers on the inside.