Hydrangea Macrophylla Black Steel Blue 5 Litre Pot

Hydrangea macrophylla ‘Black Steel Blue’ – Deep Blue Blooms with Dark, Dramatic Stems

Hydrangea macrophylla ‘Black Steel Blue’ is a striking and modern mophead hydrangea, valued for its rich, metallic blue flower heads set against deep, dark stems. The bold contrast between the vivid blooms and near-black stems creates a dramatic, contemporary look that stands out in borders and containers alike.

Flowering from early to late summer, the large rounded blooms are packed with colour and hold their intensity well, especially in more acidic soils where the blue tones deepen. The glossy green foliage provides a lush backdrop, enhancing the overall richness of the display while maintaining a neat, compact shape.

Perfect for patios, shaded borders, and feature planting, ‘Black Steel Blue’ thrives in partial shade and moist, well-drained soil. Its manageable size makes it ideal for smaller gardens or container planting, where its unique colouring can be fully appreciated up close.

Hardy, reliable, and full of character, Hydrangea ‘Black Steel Blue’ is a superb choice for gardeners looking to add bold summer colour with a refined, modern edge.

Seasonal Highlights

Spring: Fresh green foliage emerges on dark stems.
Summer: Large steel-blue mophead flowers dominate the plant.
Autumn: Blooms age to softer tones while foliage remains lush.
Winter: Deciduous structure with strong, dark stems.

Key Features

• Steel-blue flowers – Rich, intense mophead blooms.

• Dark stems – Adds contrast and a modern look.

• Compact habit – Ideal for borders and containers.

• Long flowering – Summer colour that lasts.

• Low maintenance – Easy and reliable.

Perfect For

• Shaded borders – Adds colour and contrast.

• Containers – Perfect for patios and courtyards.

• Feature planting – Eye-catching and distinctive.

• Small gardens – Big impact without large size.

• Contemporary planting – Strong colour contrast.

Growing Tips

Sun/Position: Partial shade; avoid strong midday sun.
Soil: Moist, well-drained soil; prefers slightly acidic soil for best blue colour.
Hardiness: Fully hardy across the UK.
Care: Prune lightly in spring, removing dead or weak stems only.

Looks Great With

• Shade plants – Hosta, Heuchera, Ferns.

• Silver foliage – Brunnera, Lamium.

• Evergreens – Skimmia, Euonymus.

• Other hydrangeas – Mix with whites or pinks for contrast.