Nikko Blue Hydrangea
Hydrangea macrophylla 'Nikko Blue'Nikko Blue Hydrangea is one of the most iconic mophead hydrangeas, cherished for its abundant, richly colored blooms and graceful, rounded form. In acidic soil, its flowers turn a striking sky-blue, while neutral to alkaline soil produces soft pink hues, allowing gardeners to tailor the display to their preference. Blooming on old wood, Nikko Blue bursts into color in early summer, creating a lush, romantic look that transforms garden beds, shade borders, and foundation plantings.
This hydrangea typically reaches 4–6 feet tall and wide, making it substantial enough to serve as a focal point yet versatile enough to blend beautifully into mixed plantings. Its dense foliage stays vibrant throughout the growing season, adding structure even when the blooms have faded. Ideal for cottage gardens and coastal landscapes, Nikko Blue is admired for its dependable performance and timeless aesthetic. The blooms also make excellent cut flowers, bringing soft, elegant color indoors.
Care Instructions
Planting
Choose partial shade, especially with morning sun and afternoon protection. Plant at soil level, ensuring ample spacing for airflow and mature growth.
Watering
Keep soil consistently and evenly moist. Water deeply 1–2 times weekly, increasing during heat or dry spells to prevent wilting and stress.
Pruning
Prune immediately after flowering. Since it blooms on old wood, avoid late-winter or early-spring pruning to protect next year’s buds.
Pest Control
Monitor for aphids, mites, and fungal leaf spot. Apply neem oil or insecticidal soap as needed, and maintain good air circulation.
Soil Tips
Use rich, well-draining soil. For blue blooms, maintain acidic pH; for pink tones, add garden lime. Incorporate compost annually for vigor and moisture retention.
