The foliage also is noted for its attractive, red-burgundy fall color. Like panicle hydrangea, the flowers often develop pinkish undertones as they mature. The oakleaf hydrangea is considered hardy to USDA hardiness zone 5. It should perform well in protected sites in southern Iowa, but may not survive in northern areas of the state. It prefers partial shade in fertile, moist, well-drained soil with protection from harsh winter winds.
Several cultivars are available.
These cultivars vary in plant height from 2 to 12 feet. Flower heads can be 4 to 14 inches long depending on cultivar. Not all hydrangeas are shrubs. Many notable horticulturists have praised climbing hydrangea as the best landscape vine. It clings easily to tree bark or other structures and is almost unlimited in its ability to climb, often reaching more than 50 feet in height.