Unlocking the Mysteries of Nikko Blue Hydrangea

HomePlantsFlowersUnlocking the Mysteries of Nikko Blue Hydrangea



The Nikko Blue Hydrangea stands as a testament to the beauty and diversity of the plant kingdom. This deciduous shrub, known for its vibrant blue blooms, has captivated gardeners and flower enthusiasts alike.

Botanical Name
Hydrangea macrophylla ‘Nikko Blue’
Plant Type
Deciduous shrub
4 to 6 feet
Broad, serrated leaves with a lustrous sheen
Thrives in moderate climates
Sun Exposure
Partial sun to dappled shade
Soil Requirements
Prefers acidic, Fertile, well-drained, moist soil with good organic content
Hardiness Zones
USDA zones 6-9
Flower Color
Rich, deep blue to purple, influenced by soil pH
Foliage Color
Medium green
Season Features
Blooms in early summer for up to 2 months
Medium needs, consistent moisture is crucial
  • The Nikko Blue Hydrangea is distinguished by its large, rounded flower heads densely packed with blue florets, creating a mophead effect.
  • These mophead blooms can reach up to 5 inches across, presenting a showy display.
  • Originally from Japan, the Nikko Blue Hydrangea has naturalized in various regions, including China and New Zealand, and is commonly found in seaside and mountainous areas.
  • The flower color can change with soil pH.
  • Low maintenance, requires pruning after flowering.
  • Nikko Blue Hydrangeas are prized for their ornamental value, serving as a stunning addition to foundation plantings, hedges, or container gardens.
  • The Nikko Blue Hydrangea can be propagated through softwood cuttings in late spring to early summer.
  • Generally, this hydrangea is resilient but watch for common issues like botrytis blight, bacterial wilt, leaf spot, rust, and mildew.


How do I change the color of Nikko Blue Hydrangea flowers?

Adjust soil pH: aluminum sulfate for bluer flowers, lime for pinker hues.

When is the best time to prune Nikko Blue Hydrangea?

Prune after flowering in late summer or early autumn to encourage new growth.

Are Nikko Blue Hydrangeas suitable for containers?

Yes, they can be grown in containers due to their manageable size.

How do I care for my hydrangea in winter?

Prune weak or winter-damaged stems in early spring and mulch to protect the roots.

Are there any companion plants that complement Nikko Blue Hydrangea?

Azaleas, rhododendrons, and hostas make excellent companions due to similar soil and light requirements.

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