Nikko Blue Hydrangea, Bigleaf Hydrangea 'Nikko Blue', Mophead Hydrangea 'Nikko Blue', Hortensia 'Nikko Blue'
Hugely popular – and deservedly so – Hydrangea macrophylla ‘Nikko Blue’, commonly known as Nikko Blue Hydrangea, is a highly esteemed deciduous shrub admired for its striking, large flower clusters and lush foliage. This variety is particularly popular for its ability to produce vivid blue blooms, making it a favorite among gardeners who appreciate its vibrant color and graceful appearance.
This hydrangea is a member of the Hydrangeaceae family, which includes several popular garden varieties like Hydrangea paniculata (Panicle Hydrangea), Hydrangea arborescens (Smooth Hydrangea), Hydrangea quercifolia (Oakleaf Hydrangea), Hydrangea serrata (Mountain Hydrangea), and Hydrangea anomala petiolaris (Climbing Hydrangea).
Nikko Blue Hydrangea is renowned for its large, round flower clusters that produce an abundant display of vivid blue blooms, particularly in acidic soils. When grown in neutral to alkaline soils, the flowers may shift to shades of pink. This versatility in flower color, coupled with its impressive growth habit, makes it a fantastic choice for various garden settings. The shrub features a dense growth habit, providing a lush backdrop for its stunning flowers.
A classic name in mophead hydrangeas, it has become the standard against which other blue hydrangeas are measured.
Native to regions of Japan, Hydrangea macrophylla thrives in temperate climates, particularly in woodland areas where it enjoys dappled sunlight and rich, well-drained soil. Its natural habitat allows it to adapt well to various garden conditions, making it a popular choice among gardeners seeking a low-maintenance yet visually stunning shrub.
Nikko Blue Hydrangea is a deciduous shrub characterized by its rounded, bushy growth habit. It can develop multiple stems, creating a dense, lush appearance that makes it suitable for a variety of landscape applications. Its robust structure provides a stable framework for the large flower clusters that bloom from mid-summer to fall.
Nikko Blue Hydrangea generally grows 4-6 feet (1.2-1.8 meters) tall and wide. Its compact size makes it ideal for borders, foundation plantings, or as a focal point in the garden.
The most captivating feature of Nikko Blue Hydrangea is its large, rounded flower heads, 5 inches (12 cm) in diameter. These blooms are densely packed with rich, deep blue florets, creating a lush and dramatic display.
Nikko Blue Hydrangea typically begins to bloom in early summer, with flowers continuing to develop for up to 2 months. ‘Nikko Blue’ is very floriferous and produces new flower stems throughout the summer.
The longevity of the blooms, combined with their vibrant color, makes them an excellent choice for gardeners seeking to enhance their landscapes with extended seasonal interest.
This hydrangea blooms on old wood, with its flower buds forming on the previous year’s growth. Therefore, it is best to prune it immediately after flowering.
The foliage is medium green with large, lustrous, serrated leaves, providing an attractive backdrop to the stunning flowers. It typically remains healthy throughout the growing season, contributing to the overall lush appearance of the shrub. As fall approaches, the leaves may turn to shades of yellow or burgundy, adding an additional layer of visual interest to the landscape.
Nikko Blue Hydrangea is hardy in USDA zones 6-9, making it suitable for a wide range of climates. It is salt tolerant.
Nikko Blue Hydrangea is a versatile shrub that fits beautifully into various landscaping applications. It works well as a focal point in borders with companion plants, as a specimen plant, flowering hedge, or in mass plantings for stunning visual impact. The blooms also make excellent cut flowers, adding elegance to floral arrangements. They can also be dried and preserved for use in wreaths and home decor, allowing you to enjoy their beauty year-round.
Hydrangea macrophylla attracts pollinators, such as bees and butterflies, due to its abundant flowers. The blooms provide nectar, supporting local ecosystems and enhancing biodiversity in the garden.
According to the ASPCA, Hydrangea is considered toxic to pets, including dogs and cats. It also has low-severity poison characteristics for humans: consuming large quantities can lead to nausea, stomach pain, vomiting, and sweating.
Hydrangea plants are not reliably deer-resistant.
Nikko Blue Hydrangea is not considered invasive. It is a well-behaved shrub that maintains its size and shape without spreading aggressively, making it an excellent addition to a variety of garden settings.
Nikko Blue Hydrangea offers stunning floral displays, a long blooming season, and the ability to attract pollinators. Its versatility in landscape design and ability to adapt to different soil conditions make it a favored choice for gardeners seeking beauty and resilience in their gardens.
Nikko Blue Hydrangea prefers partial shade. Full sun is tolerated if constant moisture is provided.
Thrives in fertile, well-drained soil. Adding organic matter can improve soil structure and fertility. Soil pH significantly affects flower color, with more acidic soils producing vibrant blue flowers.
Requires regular watering, especially during dry spells. Keep the soil consistently moist but not soggy, as overwatering can lead to root rot. Mulching can help retain soil moisture.
Use a balanced fertilizer (e.g., 10-10-10) in early spring as new growth begins. Fertilize again in mid-summer to support ongoing blooming. Everything you need to know about fertilizing hydrangeas.
Prune immediately after flowering to maintain shape and remove any dead or damaged wood. Avoid heavy pruning in the fall, as Nikko Blue Hydrangea blooms on old wood. Learn how to prune your hydrangea to maximize flower production.
Can be propagated through cuttings taken in late spring or early summer. Use stem cuttings with at least two nodes and root in moist potting soil. Discover how to propagate your hydrangea for more beautiful blooms.
Mulch around the base with 3-4 inches of organic material to insulate roots. Wrap smaller plants in burlap to protect against harsh winds and frost. Ensure the soil remains moist before the ground freezes, allowing the plants to enter dormancy without stress. Learn how to prepare your hydrangea bush for winter.
Watch for pests like aphids and spider mites. Powdery mildew, leaf spot, and root rot can occur in humid conditions. Regular monitoring and proper care can mitigate these issues. Popular pests and diseases affecting hydrangea plants.
Nikko Blue Hydrangea typically grows 4 to 6 feet (1.2 to 1.8 meters) tall and wide. Its compact size makes it suitable for various landscaping applications.
Yes, Nikko Blue Hydrangea can tolerate full sun; however, it thrives best in partial shade. Ideally, it should receive at least 4-6 hours of sunlight daily, with some afternoon shade preferred in hotter climates to prevent leaf scorch.
Yes, Nikko Blue Hydrangea typically blooms on old wood, meaning that the flower buds form on the previous year’s growth. This makes it important to prune it carefully to avoid cutting off the flower buds.
Nikko Blue Hydrangeas can turn pink if grown in alkaline or neutral soil. The color change occurs due to the availability of aluminum ions in the soil; more acidic conditions promote blue blooms, while higher pH levels tend to produce pink flowers.
| Hardiness |
6 - 9 |
|---|---|
| Heat Zones |
6 - 9 |
| Climate Zones | 3, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, H1 |
| Plant Type | Shrubs |
| Plant Family | Hydrangeaceae |
| Genus | Hydrangea |
| Common names | Bigleaf Hydrangea, Hydrangea |
| Exposure | Partial Sun |
| Season of Interest | Summer (Early, Mid, Late), |
| Height | 4' - 6' (120cm - 180cm) |
| Spread | 4' - 6' (120cm - 180cm) |
| Spacing | 72" (180cm) |
| Maintenance | Low |
| Water Needs | Average |
| Soil Type | Clay, Loam, Sand |
| Soil pH | Acid, Neutral |
| Soil Drainage | Moist but Well-Drained, Well-Drained |
| Characteristics | Dried Arrangements, Cut Flowers, Showy |
| Garden Uses | Beds And Borders, Hedges And Screens, Patio And Containers |
| Garden Styles | City and Courtyard, Informal and Cottage, Traditional Garden |
| Hardiness |
6 - 9 |
|---|---|
| Heat Zones |
6 - 9 |
| Climate Zones | 3, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, H1 |
| Plant Type | Shrubs |
| Plant Family | Hydrangeaceae |
| Genus | Hydrangea |
| Common names | Bigleaf Hydrangea, Hydrangea |
| Exposure | Partial Sun |
| Season of Interest | Summer (Early, Mid, Late), |
| Height | 4' - 6' (120cm - 180cm) |
| Spread | 4' - 6' (120cm - 180cm) |
| Spacing | 72" (180cm) |
| Maintenance | Low |
| Water Needs | Average |
| Soil Type | Clay, Loam, Sand |
| Soil pH | Acid, Neutral |
| Soil Drainage | Moist but Well-Drained, Well-Drained |
| Characteristics | Dried Arrangements, Cut Flowers, Showy |
| Garden Uses | Beds And Borders, Hedges And Screens, Patio And Containers |
| Garden Styles | City and Courtyard, Informal and Cottage, Traditional Garden |
How many Hydrangea macrophylla ‘Nikko Blue’ do I need for my garden?
| Plant | Quantity | |
|---|---|---|
| Hydrangea macrophylla ‘Nikko Blue’ | N/A | Buy Plants |
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Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.
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