Ornatec InternationalSpecies reference sheet · ornatecinternational.com
Hydrangea macrophylla 'Obsidian Storm Cloud'
Obsidian Storm Cloud Hydrangea
The Hydrangea macrophylla 'Obsidian Storm Cloud', commonly known as Obsidian Storm Cloud Hydrangea, is a dramatic and eye-catching deciduous shrub prized for its dark foliage and large, mophead blooms. Its flowers shift from deep blue to rich purple depending on soil pH, creating a striking contrast against its dark green to black-tinged leaves. Growing up to 1 to 1.5 metres tall and wide, this hydrangea is perfect for borders, garden beds, containers, or as a focal point in shaded gardens.
Specifications
- Height1 to 1.5 metres
- Width1 to 1.5 metres
- Native toJapan (species origin)
- FoliageDark green, often black-tinged; deciduous
- Growth rateModerate
Conditions
- SoilPrefers moist, well-drained, acidic to neutral soils; benefits from organic enrichment
- LightPartial shade to dappled sunlight; tolerates morning sun with afternoon shade
- WaterModerate; requires consistent moisture but avoid waterlogging
- ClimateThrives in temperate and subtropical regions
Additional Features
- FlowersMophead blooms in deep blue to purple tones; colour varies with soil pH
- FormCompact, bushy growth with rounded flower clusters
- UsesIdeal for borders, feature planting, containers, or shaded garden beds
- SpacingPlant 1 metre apart for dense displays or individual features
- Low MaintenanceRequires pruning of spent flowers and thinning of old stems in late winter
- Pest ResistanceGenerally resilient; monitor for aphids or powdery mildew
- Frost ToleranceHardy in cool climates; protect young plants from severe frost
- Wildlife AttractionFlowers attract pollinators like bees and butterflies
- Seasonal AppealDeciduous foliage provides summer colour and seasonal flowers
- VersatilityComplements cottage, woodland, and formal garden styles
The Obsidian Storm Cloud Hydrangea is a bold and sophisticated choice for gardens, offering stunning seasonal colour and year-round interest. Its unique foliage and vibrant blooms make it a standout feature in any landscape.
Availability by project review. Sizes, quantities, origin and export readiness are confirmed after your plant schedule is reviewed against destination, timing and quarantine requirements. MEWA certified for supply into Saudi Arabia; Australian Export Registered Establishment.
Enquiries: sales@ornatecinternational.com
310 Donkin Rd, Utchee Creek QLD 4871, Australia
Prepared 15 August 2026