Hydrangea macrophylla Nikko Blue
Hydrangea macrophylla Nikko Blue
Hydrangea macrophylla Nikko Blue
Hydrangea macrophylla Nikko Blue
Hydrangea macrophylla Nikko Blue
Hydrangea macrophylla Nikko Blue
Hydrangea macrophylla Nikko Blue
Hydrangea macrophylla Nikko Blue
Bigleaf Hydrangea, French Hydrangea, Lacecap Hydrangea
small young plant but well-balanced - grows fast!
SHINRA TENSEI, 08/07/2025
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Description
The Nikko Blue Hydrangea macrophylla, originating from Nikko in Japan, is an incredibly floriferous and hardy hydrangea perfect for small gardens in cold regions. Its flower clusters bloom from early summer to October, and their colour depends on the soil's acidity. Acidic soil or soil rich in aluminium sulphate will produce a stunning azure blue hue, while neutral soil will result in a charming pastel pink. Though it may take some time to establish itself, this shrub will reward patient gardeners with 3 to 4 months of gorgeous flowers in a semi-shaded garden or terrace area.
The 'Nikko Blue' hydrangea belongs to the Hydrangeae family and is derived from a species of Hydrangea macrophylla native to China and Japan. At maturity, this bushy and well-branched shrub spreads to approximately 1.20 m (3 ft 11 in) in height and 1.50 m (4 ft 11 in) in width. During the summer months, from June to October, its small sterile flowers with 4 petals are clustered on dense, slightly flattened spherical flower heads, which are about 15 cm (5.9 in) in diameter. These flower heads can range from blue to pink and will be light or intense blue if the shrub is grown in acidic soil or soil rich in aluminium sulphate. The flowers are carried by flexible and slender stems aged one year or more. The shrub features beautiful dark green foliage, which is somewhat rounded and takes on yellow or red hues in autumn before falling off. The foliage is opposite on the branches and reaches about ten centimetres in length. The leaves are simple, ovate, ending in a pointed tip and are strongly toothed like a saw. Hydrangeas have a lifespan of at least 50 years.
The 'Hydrangea Nikko Blue' is a versatile plant that can be grown in gardens of all sizes. It can also be used as a beautiful shrub on terraces or balconies. Macrophylla hydrangeas are an essential choice for semi-shaded areas of your garden. Nikko Blue will complement a white hydrangea such as Madame Mouilère, Libelle, or even Great Star Blanc Bleu. While hydrangeas dislike limestone, they are not exclusively suited for heather soil. However, the colour of their flower heads is often influenced by the nature of the soil. Co-planting with magellanica fuchsias, Pieris, Sarcococca, annual impatiens, or spring-flowering bulbs and lilies creates a striking display. You can enjoy their stunning blooms in the garden or bring them inside to place in a vase.
Please note that the colour of the flowers on macrophylla hydrangeas depends on the soil pH level in which they are planted. Blue varieties of hydrangeas typically turn pink when planted in neutral or alkaline soil. If you want to maintain the blue colour of your hydrangeas, add ericaceous soil or sphagnum moss to your garden soil and add aluminium sulphate (slate contains aluminium sulphate) or alum stone every spring.
Hydrangea macrophylla Nikko Blue in pictures
Plant habit
Flowering
Foliage
Botanical data
Hydrangea
macrophylla
Nikko Blue
Hydrangeaceae
Bigleaf Hydrangea, French Hydrangea, Lacecap Hydrangea
Cultivar or hybrid
Planting and care
Plant the hydrangea in a partially shaded area with neutral to acidic soil for optimal growth. If your soil is not acidic, mix 50% ericaceous compost with your garden soil before planting. Ensure the soil is worked deeply before planting. A good base fertiliser like blood, fish and bone will give the plant nutrients without causing the roots to burn. If your soil tends to be dry, create a surface watering basin. Do not cut the dry umbels in late summer, as they protect the terminal shoots of the branches during winter. Instead, cut all the dry flowers in late February or during the first few days of spring.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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