Troubleshooting
Heuchera 'Carnival Rose Granita' problems — and how to fix them
Heuchera 'Carnival Rose Granita' (Heuchera 'Carnival Rose Granita') 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 rot
Overwatering or poor drainage quickly leads to crown rot; plant with the crown at soil level and improve drainage before planting.
Vine weevil
Adults notch leaf margins; grubs destroy roots. Apply nematode drenches in late summer as a preventative measure.
Powdery mildew
White coating on leaves in humid, warm conditions; remove affected leaves and improve airflow.
Leaf scorch
Pale, bleached leaf patches from direct afternoon sun; relocate or provide shade cloth in hot summers.
Frost heaving
Shallow roots can be displaced by repeated freeze-thaw; press back and mulch around (not over) the crown each autumn.
Prevent heuchera 'carnival rose granita' problems before they start
Most heuchera 'carnival rose granita' issues are care-mismatch, not bad luck. Dial in the basics:
Heuchera 'Carnival Rose Granita' problems — FAQ
Why is my heuchera 'carnival rose granita' crown rot?
Overwatering or poor drainage quickly leads to crown rot; plant with the crown at soil level and improve drainage before planting.
Why is my heuchera 'carnival rose granita' vine weevil?
Adults notch leaf margins; grubs destroy roots. Apply nematode drenches in late summer as a preventative measure.
Why is my heuchera 'carnival rose granita' powdery mildew?
White coating on leaves in humid, warm conditions; remove affected leaves and improve airflow.
Why is my heuchera 'carnival rose granita' leaf scorch?
Pale, bleached leaf patches from direct afternoon sun; relocate or provide shade cloth in hot summers.
Why is my heuchera 'carnival rose granita' frost heaving?
Shallow roots can be displaced by repeated freeze-thaw; press back and mulch around (not over) the crown each autumn.