Mountain Hydrangea (Hydrangea serrata)

Mountain Hydrangeas are compact, cold-hardy shrubs native to the mountainous regions of Japan and Korea. Similar in appearance to Bigleaf Hydrangeas, they feature smaller, more delicate lacecap flowers and finely textured foliage. Their ability to withstand colder climates makes them a great choice for northern gardens, and their blooms can also change color based on soil pH.

Category

Sun Needs:

  • Partial sun
  • Prefers morning sun with afternoon shade
  • Can tolerate more sun in cooler climates
  • Too much shade may reduce blooming

Bloom Time:

  • Late spring through summer
  • Produces lacecap-style flower clusters
  • Flower color varies with soil pH (blue in acidic, pink in alkaline)
Size:

Height: 2 to 4 feet
Width: 2 to 4 feet

Attributes:
  • Delicate lacecap blooms in pink, blue, or purple
  • Compact, mounded growth habit
  • Cold-hardy and reliable bloomer
  • Attractive serrated foliage
  • Ideal for borders, woodland gardens, and small spaces
Care Tips:
  • Plant in well-draining, organically rich soil
  • Water regularly, especially during dry spells
  • Mulch to retain moisture and protect roots
  • Fertilize in early spring with a balanced or bloom-boosting fertilizer
  • Prune after flowering (blooms on old wood)
Pest watch:
  • Generally pest-resistant, but monitor for aphids and powdery mildew

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