Troubleshooting
Heuchera 'Pewter Moon' problems — and how to fix them
Heuchera 'Pewter Moon' (Heuchera 'Pewter Moon') 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
The most common cause of death in Heuchera; always ensure the planting site drains freely and the crown sits at soil level rather than buried.
Vine weevil
Notched leaf margins from adult weevils and root damage from larvae; nematode drench in late summer is the safest and most effective treatment.
Foliar nematodes
Angular brown patches spreading between leaf veins indicate foliar nematode infestation; promptly remove affected leaves and avoid wetting foliage.
Powdery mildew
White surface fungus in warm, dry, poorly ventilated spots; thin planting and apply a dilute bicarbonate spray at early stages.
Winter wet damage
In particularly wet winters, even hardy specimens can suffer; a cold frame or temporary overhead protection preserves foliage quality.
Prevent heuchera 'pewter moon' problems before they start
Most heuchera 'pewter moon' issues are care-mismatch, not bad luck. Dial in the basics:
Heuchera 'Pewter Moon' problems — FAQ
Why is my heuchera 'pewter moon' crown rot?
The most common cause of death in Heuchera; always ensure the planting site drains freely and the crown sits at soil level rather than buried.
Why is my heuchera 'pewter moon' vine weevil?
Notched leaf margins from adult weevils and root damage from larvae; nematode drench in late summer is the safest and most effective treatment.
Why is my heuchera 'pewter moon' foliar nematodes?
Angular brown patches spreading between leaf veins indicate foliar nematode infestation; promptly remove affected leaves and avoid wetting foliage.
Why is my heuchera 'pewter moon' powdery mildew?
White surface fungus in warm, dry, poorly ventilated spots; thin planting and apply a dilute bicarbonate spray at early stages.
Why is my heuchera 'pewter moon' winter wet damage?
In particularly wet winters, even hardy specimens can suffer; a cold frame or temporary overhead protection preserves foliage quality.