Plant Profile: Hydrangea quercifolia

The Oakleaf Hydrangea is a deciduous shrub that can reach heights of up to 8 feet. Its leaves, which resemble oak leaves, measure between 4 to 12 inches and are initially fuzzy. In late fall, these leaves transform into vibrant shades of red or purple. During late spring and summer, the shrub produces a pyramidal cluster of white flowers that gradually change to purple. By fall, small, dry seeds develop.

This hydrangea thrives in organically rich, well-drained soils that maintain medium moisture levels, and it prefers full sun to partial shade. While it requires some sunlight to produce blooms, it flourishes in moist conditions and benefits from summer mulch to help retain soil moisture. Flowering occurs on old wood, so if pruning is necessary, it should be done right after flowering, as minimal pruning is typically required. Any winter-damaged stems can be trimmed in early spring. In USDA Zone 5, it’s advisable to provide a sheltered location and winter protection, such as mulch or burlap wrap, especially for plants that are not fully established. In harsh winters, with temperatures dropping below -10 degrees Fahrenheit, the plant may lose a significant number of flower buds or even die back to the ground, which can severely affect or completely eliminate blooms for the following year.

In terms of pests and diseases, the Oakleaf Hydrangea is somewhat vulnerable to leaf blight and powdery mildew. It may also attract aphids and spider mites, and deer are known to enjoy feasting on this plant.

**Note:** The plant is only toxic if consumed in large quantities.

**Quick Identification Tips:**
- Height: 4-8 feet
- Type: Deciduous shrub with an upright, irregular shape
- Soil: Requires moist, fertile, well-drained soil; mulching is recommended to keep roots cool (but not overly wet); can thrive in full sun or partial shade.
- Blooming Season: Flowers appear in May and June, lasting throughout the summer; foliage changes to red, rust, and purple in the fall, often persisting into winter.
- Pest/Disease Resistance: Generally free from serious issues; makes an excellent specimen plant or can be used in shrub borders; tolerant of dry conditions and sandy soil.

For further details on Hydrangea, additional resources are available.