Nikko Blue Hydrangea

Nikko Blue Hydrangea is a classic bigleaf hydrangea known for its large, rounded clusters of vivid blue flowers. In properly acidic soil with available aluminum, the blooms develop their strongest blue coloring. Less acidic soil may produce lavender, purple, or pink flowers instead.

Its bold summer blooms and lush green foliage bring an old-fashioned garden appearance to foundation plantings, shaded borders, woodland edges, mixed shrub beds, and large containers. The full mophead flowers also make beautiful additions to fresh-cut arrangements.

Plant Nikko Blue Hydrangea where it receives morning sun and protection from intense afternoon heat. This is especially important in Georgia and other Southern areas, where hot afternoon sunlight can cause wilting, leaf scorch, and faster moisture loss. Choose moist, well-drained soil containing plenty of organic matter.

Water deeply and regularly while the shrub becomes established and during extended periods of hot, dry weather. A two- to three-inch layer of mulch can help retain soil moisture and keep the roots cooler. Keep the mulch several inches away from the main stems.

Before adding products intended to create blue flowers, test the soil. Changing hydrangea color is a gradual process, and adding too much soil amendment can damage the plant or create nutrient problems.

Nikko Blue Hydrangea blooms primarily on old wood, meaning many flower buds develop on stems produced during the previous growing season. Avoid heavy pruning in fall, winter, or early spring. Wait until new growth appears before removing stems that are clearly dead or damaged. Any additional shaping should be completed shortly after flowering. Our Old Wood vs. New Wood Hydrangeas guide explains why pruning time is especially important for bigleaf hydrangeas.

The Missouri Botanical Garden Nikko Blue Hydrangea profile provides additional information about flower color, soil, sunlight, mature size, and landscape use.

With afternoon protection, consistent moisture, and careful pruning, Nikko Blue Hydrangea can provide traditional blue mophead flowers for many growing seasons.