Details
 
'Obsidian' is a compact, mound-forming perennial, spreading to 40cm, with distinctive lobed, glossy leaves, reddish-black in spring, darkening to near-black as they mature. Racemes of small creamy flowers are borne above the leaves in summer on dark reddish stems, usually 25-40cm, sometimes taller
 
 
 
 
 
Ultimate height 0.1-0.5 metres
 
Ultimate spread 0.1-0.5 metres
 
Time to ultimate height 2-5 years
 

Hardiness
H6 - Hardy in all of UK and northern Europe (-20 to -15)

Aspect
South-facing or North-facing or West-facing or East-facing

Exposure
Exposed or Sheltered

Moisture
Moist but well-drained
 

Soil
Sand, Loam

pH
Neutral



How to grow
Cultivation
Grow in a fertile, moist but well-drained, neutral soil in sun or partial shade. The woody rootstock tends to lift out of the ground so mulch annually or lift and replant
Propagation
Propagate by division in autumn
Suggested planting locations and garden types
Flower borders and beds Underplanting of Roses and Shrubs City & Courtyard Gardens Coastal Cottage & Informal Garden Patio & Container Plants Rock Garden

How to care
Pruning
Remove faded flower spikes
Pests
Prone to vine weevils and leaf eelworms
Diseases
Generally disease free