About Nikko Blue Bigleaf Hydrangea Bare Root Hydrangea Bush

Hydrangea macrophylla ‘Nikko Blue’
Type: Bigleaf Mophead Hydrangea | Origin: Japanese hydrangea selection | Hardiness: USDA Zones 6–9

💙 Big, beautiful blue flowers and lush green foliage—Nikko Blue is the classic hydrangea that has been charming gardeners for generations.

Nikko Blue produces spectacular rounded clusters of blue flowers against large, glossy green leaves. In acidic soils, the blooms develop their signature blue coloring, while more alkaline conditions can produce lavender or pink flowers.

🌸 Flower & Garden Details

Flower Color: Blue in acidic soils; lavender to pink in alkaline soils
Flower Form: Large, rounded mophead clusters
Bloom Season: Early to midsummer
Foliage: Large, glossy green leaves
Habit: Rounded, bushy shrub
Mature Size: Approximately 4–6 feet tall and wide
Light: Morning sun with afternoon shade
Hardiness: USDA Zones 6–9
Bloom Wood: Primarily old wood
Cut Flower: Excellent fresh or dried
Best Uses: Cottage gardens, shaded borders, foundation plantings and cutting gardens

💙 The Secret Behind Those Blue Flowers

Nikko Blue is a classic Japanese bigleaf hydrangea selection, treasured for its generous mophead blooms and rich coloring.

Unlike white panicle hydrangeas, its flower color can change with soil chemistry. Acidic soil with available aluminum encourages blue flowers, while alkaline soil typically produces pink blooms. This makes Nikko Blue especially fascinating for gardeners who love experimenting with flower color.

💛 Why Grace Rose Farm Loves It

There's something wonderfully nostalgic about a big blue hydrangea.

We love Nikko Blue for its lush, romantic flowers and the beautiful contrast it creates alongside pink, cream and apricot roses. Its large blooms are gorgeous in summer bouquets, and mature flowers can be dried for arrangements that last well beyond the growing season.

🌿 Planting & Care

Plant your bare root hydrangea in rich, well-drained soil with consistent moisture, preferably where it receives morning sunlight and protection from hot afternoon sun.

Nikko Blue blooms primarily on old wood, so avoid pruning in fall or early spring. If shaping is necessary, prune immediately after flowering. In colder climates, protect the stems and flower buds from winter damage, as the shrub may survive winter but fail to bloom if its buds are killed.