Mountain Hydrangea Plant Care
Hydrangea serrata (Thunb.) Ser.
Hydrangea serrata is a species of flowering plant in the family Hydrangeaceae, native to mountainous regions of Korea and Japan. Common names include mountain hydrangea and tea of heaven.
Every 3–7 days
Partial shade to filtered sun
60–75°F
40–70%
What Is the Mountain Hydrangea?
Mountain Hydrangea (Hydrangea serrata) belongs to the Hydrangeaceae family within the Hydrangea genus. Mountain Hydrangea is native to mountainous regions of Korea and Japan. Mountain Hydrangea is also known as Tea of Heaven.
Mountain Hydrangea displays a deciduous shrub, mounding habit growth habit, reaching up to 6 inches tall with a spread of approximately 6 inches. Mountain Hydrangea produces large, showy clusters of pink, blue, purple, or white flowers.
Leaf size: approximately 6 inches.
How Often Should You Water a Mountain Hydrangea?
Hydrangea serrata requires watering every 3–7 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 3–7 days
Let soil partially dry between waterings
What Light Does the Mountain Hydrangea Need?
Mountain Hydrangea thrives in partial shade to filtered sun light conditions. The optimal light range is 100–500 lux. Avoid placing Mountain Hydrangea in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Partial shade to filtered sun
100–500 lux
What Temperature and Humidity Does the Mountain Hydrangea Prefer?
Hydrangea serrata grows best at temperatures between 60°F and 75°F. Mountain Hydrangea prefers humidity levels of 40–70%.
Temperature
60–75°F
Humidity
40–70%
What Soil Mix Works Best for a Mountain Hydrangea?
Rich, moist, well-draining soil with plenty of organic matter. Good drainage is essential for Mountain Hydrangea to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Mountain Hydrangea?
Repot every 2-3 years in spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Mountain Hydrangea?
Mountain Hydrangea can be propagated through softwood cuttings, layering, division. Similar propagation techniques also apply to hydrangea plant care, which shares the same genus.
Fertilizing
Every 4 months
During the growing season
Is the Mountain Hydrangea Toxic to Pets and Children?
Non-Toxic
Non-toxic to humans and pets
What Pests and Diseases Affect the Mountain Hydrangea?
Mountain Hydrangea is susceptible to aphids, spider mites, scale insects. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
What USDA Hardiness Zone Does the Mountain Hydrangea Need?
Mountain Hydrangea grows outdoors in USDA Zone 13a. Native to mountainous regions of Korea and Japan, Mountain Hydrangea is adapted to warm climates. In cooler regions, grow Mountain Hydrangea as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Mountain Hydrangea is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Hydrangea genus — compare its care with other Hydrangea species on PlantoScan.
Mountain Hydrangea tolerates low-light rooms and shaded spots — browse the full list of low-light plants.
More Hydrangea Species
Other Hydrangea species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
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