Troubleshooting
Coral Bells 'Obsidian' problems — and how to fix them
Coral Bells 'Obsidian' (Heuchera 'Obsidian') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Crown heaving
Freeze-thaw cycles push the shallow crown above the soil over winter. Re-firm or replant it slightly deeper in spring and mulch to protect it.
Vine weevil
Larvae devour the roots and cause abrupt collapse, especially in containers. Check the rootball, treat with nematodes, and remove the C-shaped grubs.
Leaf scorch
Strong afternoon sun browns or fades the dark leaves, especially if roots are dry. Site in part shade and keep soil evenly moist.
Powdery mildew and rust
Crowded, damp conditions invite fungal coatings and pustules. Improve spacing and airflow, water at the base, and remove affected leaves.
Prevent coral bells 'obsidian' problems before they start
Most coral bells 'obsidian' issues are care-mismatch, not bad luck. Dial in the basics:
- Common coral bells 'obsidian' problems — our other guide for the same plant
- What's wrong with my plant? — the diagnosis apps compared
- Coral Bells 'Obsidian' watering schedule
- Coral Bells 'Obsidian' light requirements
- Best soil mix for coral bells 'obsidian'
- Coral Bells 'Obsidian' temperature & humidity
- Full coral bells 'obsidian' care guide
Looking for coral bells 'obsidian' in general rather than its problems? Read the full coral bells 'obsidian' care guide — light, water, soil and feeding.
Coral Bells 'Obsidian' problems — FAQ
Why is my coral bells 'obsidian' crown heaving?
Freeze-thaw cycles push the shallow crown above the soil over winter. Re-firm or replant it slightly deeper in spring and mulch to protect it.
Why is my coral bells 'obsidian' vine weevil?
Larvae devour the roots and cause abrupt collapse, especially in containers. Check the rootball, treat with nematodes, and remove the C-shaped grubs.
Why is my coral bells 'obsidian' leaf scorch?
Strong afternoon sun browns or fades the dark leaves, especially if roots are dry. Site in part shade and keep soil evenly moist.
Why is my coral bells 'obsidian' powdery mildew and rust?
Crowded, damp conditions invite fungal coatings and pustules. Improve spacing and airflow, water at the base, and remove affected leaves.