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Blue HydrangeaHydrangea macrophylla ‘Nikko’

  • Blue Hydrangea bush  - Hydrangea macrophylla Nikko Blue
Noted for its giant, long-lasting, summer-blooming blue flowers ranging from 4–8 inches across.

Hardiness Zones

The blue hydrangea can be expected to grow in Hardiness Zones 6–9. View Map

Tree Type

Mature Size

The blue hydrangea grows to a height of 3–6' and a spread of 3–6' at maturity.

Growth Speed Fast Growth Rate

This shrub grows at a fast rate, with height increases of more than 24" per year.

Sun Preference

Full sun and partial shade are best for this shrub, meaning it prefers a minimum of 4 hours of direct, unfiltered sunlight each day.

Soil Preference

The blue hydrangea grows in acidic, loamy, moist, rich, sandy, silty loam and well-drained soils.


This shrub:
  • Produces giant, long-lasting blue mophead blooms measuring 4–8" in diameter. It will typically flower July through August.
  • Features large, medium to dark green leaves--4–8" long--with coarsely serrated margins.
  • Grows in a rounded shape.
  • May bloom more than once a season.
  • Should be pruned after flowering because buds form on the previous season's growth.
  • May produce blooms with a pink hue in more alkaline soils.


There is an overabundance of Hydrangea macrophylla cultivars, and many of them have been renamed because the original names were lost over time.