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Heuchera 'Obsidian' (Alum root 'Obsidian')
2 hours care
per year
per year
0.5m
Max height
Max height
0.4m
Max spread
Max spread
2-5 years
To maturity
To maturity
Plant details
Botanical name
Heuchera 'Obsidian'
Other names
Coral bells 'Obsidian', Coral flower 'Obsidian', Alum root 'Obsidian'
Genus
Heuchera Heuchera
Variety or Cultivar
'Obsidian' _ 'Obsidian' is a clump-forming, semi-evergreen perennial with smooth, glossy, rounded, lobed, dark purple-black leaves and tall red stems bearing loose panicles of ivory flowers in summer.
Heuchera 'Obsidian' is: Semi evergreen
Habit
Clump-forming
Flower
Cream in Summer
Foliage
Black, Dark-purple in All seasons
How to care
Watch out for
Specific pests
Vine weevil , Leaf and bud eelworms Vine weevil , Leaf and bud eelworms
General care
Pruning
Remove faded flower spikes.
Propagation methods
Division
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Where to grow
Heuchera 'Obsidian' (Alum root 'Obsidian') will reach a height of 0.5m and a spread of 0.4m after 2-5 years.
Suggested uses
Beds and borders, Cottage/Informal, Waterside, Banks and Slopes, City, Ground Cover, Underplanting
Cultivation
Plant in a fertile, moist but well-drained, neutral soil in sun or partial shade.
Soil type
Loamy, Sandy
Soil drainage
Well-drained, Moist but well-drained
Soil pH
Neutral
Light
Partial Shade, Full Sun
Aspect
North, South, East, West
Exposure
Exposed, Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
Companion plants
We do not currently have companion plants added for this plant.
Botanical name
Heuchera 'Obsidian'
Other names
Coral bells 'Obsidian', Coral flower 'Obsidian', Alum root 'Obsidian'
Genus
Heuchera Heuchera
Variety or Cultivar
'Obsidian' _ 'Obsidian' is a clump-forming, semi-evergreen perennial with smooth, glossy, rounded, lobed, dark purple-black leaves and tall red stems bearing loose panicles of ivory flowers in summer.
Foliage
Semi evergreen
Habit
Clump-forming
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Colour
Flower
Cream in Summer
Foliage
Black, Dark-purple in All seasons
How to care
Watch out for
Specific pests
Vine weevil , Leaf and bud eelworms
General care
Pruning
Remove faded flower spikes.
Propagation methods
Division
Monthly care advice
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Where to grow
Heuchera 'Obsidian' (Alum root 'Obsidian') will reach a height of 0.5m and a spread of 0.4m after 2-5 years.
Suggested uses
Beds and borders, Cottage/Informal, Waterside, Banks and Slopes, City, Ground Cover, Underplanting
Cultivation
Plant in a fertile, moist but well-drained, neutral soil in sun or partial shade.
Soil type
Loamy, Sandy
Soil drainage
Well-drained, Moist but well-drained
Soil pH
Neutral
Light
Partial Shade, Full Sun
Aspect
North, South, East, West
Exposure
Exposed, Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
USDA zones
Zone 9, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4
In order to add a note on this plant, please add this plant to your plant lists.
| This plant likes... | Garden match | |
| Soil types: | Loamy, Sandy | Tell us... |
| Soil drainage: | Well-drained, Moist but well-drained | Tell us... |
| Soil pH: | Neutral | Tell us... |
| Light: | Partial Shade, Full Sun | Tell us... |
| Aspect: | North, South, East, West | Tell us... |
| Exposure: | Exposed, Sheltered | Tell us... |
| Hardiness: | Hardy (H4) | Tell us... |
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Dying Heuchera
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