Shrub

Hydrangea macrophylla ‘Black Steel Blue’

Hydrangea 'Black Steel Blue'
Hardiness H5

Deep blue mophead flowers stand out against the striking dark purple-black stems of Hydrangea macrophylla ‘Black Steel Blue’. This compact shrub brings strong contrast to sheltered borders and containers, with acidic soil required to maintain reliable blue colouring.

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Flowering Months
Jan J
Feb F
Mar M
Apr A
May M
Jun J
Jul J
Aug A
Sep S
Oct O
Nov N
Dec D
Size
Max Height
1.0 m — 1.5 m
Max Spread
0.1 m — 0.5 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.
Full 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.
South East West
Exposure Exposure describes how sheltered or exposed a plant’s position is, particularly to wind and weather.
Exposed / Sheltered
Hardiness Hardiness indicates how well a plant tolerates cold conditions outdoors. Higher ratings generally mean greater frost tolerance.
(−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

Hydrangea macrophylla ‘Black Steel Blue’ Description

Hydrangea macrophylla ‘Black Steel Blue’ is a compact deciduous shrub selected for its dark, nearly black stems and large rounded blue flower heads. Broad green leaves form a dense background, while the contrasting stems remain visible between the blooms. In less acidic soil the flowers may become violet or pinkish. Plants generally reach around 1 to 1.2 metres high and wide. Grow in partial shade or gentle morning sun in fertile, humus-rich acidic soil that remains consistently moist but drains freely. Use ericaceous compost and rainwater in containers. It is hardy in sheltered Irish gardens, although late frost can damage flower buds. Remove old flower heads and dead stems in spring, preserving healthy older wood.

Planting Guide for Hydrangea macrophylla ‘Black Steel Blue’

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Care guide for Hydrangea macrophylla ‘Black Steel Blue’

Items must be returned within 30 days after receiving your order. Items must be returned in the same condition in which they were received, be unworn/unused, have any tags still attached, and include all the original packaging.

Uses for Hydrangea macrophylla ‘Black Steel Blue’ & Garden Styles it suits

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