- Both new and old wood have different ornamental characteristics that are beneficial in identifying this species and also lend interest in the winter garden. New shoots are covered with dense rusty-colored hairs. As the plant matures, the bark begins to exfoliate in large flakes, revealing beautiful cinnamon-colored wood beneath. The bark also has prominent lenticils, or raised bumps that the plant uses in gas exchange. In the winter, the stems will appear stout and crooked, giving the plant a gangly appearance.
- Oakleaf hydrangeas can range from 4 to 8 feet tall, and sometimes up to 12 feet depending on variety. Oakleaf hydrangeas have a radiating growth habit and are often wider than they are tall. Hydrangea quercifolia is a slow grower when young, but once the roots take hold they can achieve medium growth rates. Plants grown in full shade are often more loose than those grown in full sun. Take this into consideration when choosing a site for your oakleaf hydrangea.
- Like the Northern red oak, Hydrangea quercifolia has beautiful fall color. Leaves can be up to 10 to 12 inches in length, making the display even more spectacular. Colors can range from red to wine, orange-brown, burgundy or purple. Specimens planted in shady areas will show color that is a little more bronze-green. The more sun, the better the fall color. Oakleaf hydrangeas can tolerate some sun, but in hot, dry areas, a shady spot is best for overall health.
- The flowering time of Hydrangea quercifolia varies depending on variety and location. In warmer climates, flowering can begin as early as April, and in cooler climates as late as July. Flowers of oakleaf hydrangea are borne on upright, pyramidal stems. The flower color can range from white to creamy white, fading into a range of pink to almost red. Flowers can be up to 10 to 12 inches long, with some varieties like "Snowflake" reaching 15 inches in length.
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