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Hydrangea macrophylla ‘Nikko Blue’

Hydrangea 'Nikko Blue'

Good for cut flowers badge Hardiness H5

Large rounded blue mophead flowers make Hydrangea macrophylla ‘Nikko Blue’ one of the classic blue hydrangeas. This vigorous shrub reaches around 1.5 metres and develops its clearest colour in acidic, aluminium-rich soil with consistent moisture and gentle partial shade.
SKU: HYDR-59-Y
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Plant Details

Flowering Months

January, not a flowering month
February, not a flowering month
March, not a flowering month
April, not a flowering month
May, not a flowering month
June, flowering month
July, flowering month
August, flowering month
September, not a flowering month
October, not a flowering month
November, not a flowering month
December, not a flowering month

Size

Max Height
1.0 m — 1.5 m
Max Spread
1.0 m — 1.5 m
Growth Habit
Densely branched plant with compact, leafy, rounded overall shape.

Planting Position

Sunlight Indicates how much direct sunlight the plant needs each day. Full sun means 6+ hours, part shade is filtered or morning sun, and full shade is little to no direct sun.
Part Shade
Aspect Aspect refers to the direction the planting spot faces (north, south, east or west). It affects light levels, warmth and exposure.
North East West
Exposure Exposure describes how sheltered or exposed a plant’s position is, particularly to wind and weather.
Sheltered
Hardiness Hardiness indicates how well a plant tolerates cold conditions outdoors. Higher ratings generally mean greater frost tolerance.
Hardiness H5 (−15 to −10 °C) Cold-hardy

Ideal Soil Conditions

Soil Type Soil type describes the texture of the soil (clay, sand, loam, chalk). This affects drainage, nutrients and how roots grow.
Clay Loam
Soil Moisture Soil moisture tells you how wet or dry the soil should be for best growth. Match this to your garden conditions for healthier plants.
Moist but permeable / Free draining
Soil pH Soil pH measures how acidic or alkaline the soil is. It affects nutrient availability and can impact plant growth.
Acid Neutral

Plant Uses & Merits

Uses
  • Patios / Courtyards
  • Coastal Areas
  • Flower Borders
  • Against Wall
Merits
  • Good for Cut Flowers

Hydrangea macrophylla ‘Nikko Blue’ Description

Hydrangea macrophylla ‘Nikko Blue’ is a traditional deciduous mophead hydrangea producing large rounded flower heads from midsummer into autumn. Blooms develop clear blue shades in acidic soil where aluminium is available but become mauve or pink in neutral to alkaline ground. Mature plants generally reach around 1.2 to 1.5 metres high and wide. Grow in partial shade or gentle morning sun in fertile, humus-rich soil that remains consistently moist but drains freely. It performs particularly well in Ireland’s cool, moist climate, although late frost may damage flower buds. Use ericaceous compost and rainwater if growing in a container for reliable blue colour. Prune lightly in spring, removing faded flower heads and dead wood while preserving healthy older stems.

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