Mountain Hydrangea: Features and Care

The Mountain Hydrangea is a deciduous shrub native to the mountainous regions of Japan. Blooming during the rainy season, its delicate appearance and soft colors make it a popular choice for gardens and potted plants.
This article explores the key features, cultural significance, history, and care guidelines for growing Mountain Hydrangeas.
Basic Information
- Scientific Name: Hydrangea serrata
- Family: Hydrangeaceae
- Native Region: Japan (Honshu, Shikoku, Kyushu)
- Appearance:
This deciduous shrub grows to a height of 1–2 meters and features small flower clusters. The lacecap flowers, which form a flat shape, display colors such as blue, pink, and white, depending on soil acidity. The central fertile flowers are surrounded by showy sterile flowers, creating a distinctive structure. - Blooming Season: June–July
Cultural Significance Around the World
Mountain Hydrangeas have long been a part of Japan’s gardening culture. They are commonly planted in temple gardens and home landscapes, symbolizing the rainy season. In traditional tea ceremonies, they are also used as an elegant floral decoration in the tokonoma (alcove).
In recent years, they have gained popularity overseas, particularly among gardening enthusiasts interested in Japanese landscapes. They are often incorporated into garden designs in Europe and North America, where they add a natural and refined aesthetic.
Historical Episodes
Mountain Hydrangeas have been admired in Japan for centuries, with references appearing in waka poetry from the Heian period (794–1185). During the Edo period (1603–1868), selective breeding led to the development of various cultivated varieties. The widespread appreciation of ornamental gardening further contributed to their popularity.
In the Meiji era (1868–1912), as Western hydrangea species were introduced to Japan, Mountain Hydrangeas were also exported to Europe. They were planted in botanical gardens in England and France, allowing their unique beauty to become known abroad.
Gardening Advice
Mountain Hydrangeas are hardy and easy to grow. Following proper care techniques will enhance their beauty.
Sunlight
Prefers partial shade. Too much direct sunlight can scorch the leaves, making shaded or lightly sunlit areas ideal.
Watering
Keep the soil moist, especially during dry periods. Potted plants require more frequent watering.
Soil
Prefers slightly acidic soil. Mixing in soil formulated for blueberries can improve growth. Good drainage and moisture retention are essential.
Fertilizing
Apply slow-release fertilizer in early spring and again after flowering. Avoid excessive fertilization, as it can reduce blooming.
Pruning
Prune after flowering to protect the buds for the following year. Removing old or crowded branches encourages healthy growth.
Conclusion
Mountain Hydrangeas are native to Japan’s mountainous regions and are closely associated with the rainy season. Their delicate lacecap flowers and subtle colors make them a great choice for gardens and potted plants.
Traditionally used in Japanese tea culture and garden landscapes, they gained international recognition in the Meiji era. Preferring partial shade and moist conditions, they thrive with proper care, adding a graceful touch to any garden.