Troubleshooting
Heuchera 'Green Spice' problems — and how to fix them
Heuchera 'Green Spice' (Heuchera 'Green Spice') 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
Caused by waterlogged soil or mulch piled against the crown; lift and replant in a raised, well-draining site.
Vine weevil
Larvae eat roots, causing sudden wilting; drench soil with a nematode treatment (Steinernema kraussei) in late summer.
Foliar nematodes
Angular brown patches between leaf veins indicate foliar nematode damage; remove and destroy affected leaves and improve air circulation.
Powdery mildew
White coating on leaves in humid, low-airflow conditions; thin planting and apply a dilute neem-oil spray at first sign.
Heaving
Freeze-thaw cycles can push shallow-rooted crowns out of the ground; mulch lightly around (not over) the crown in autumn.
Prevent heuchera 'green spice' problems before they start
Most heuchera 'green spice' issues are care-mismatch, not bad luck. Dial in the basics:
Heuchera 'Green Spice' problems — FAQ
Why is my heuchera 'green spice' crown rot?
Caused by waterlogged soil or mulch piled against the crown; lift and replant in a raised, well-draining site.
Why is my heuchera 'green spice' vine weevil?
Larvae eat roots, causing sudden wilting; drench soil with a nematode treatment (Steinernema kraussei) in late summer.
Why is my heuchera 'green spice' foliar nematodes?
Angular brown patches between leaf veins indicate foliar nematode damage; remove and destroy affected leaves and improve air circulation.
Why is my heuchera 'green spice' powdery mildew?
White coating on leaves in humid, low-airflow conditions; thin planting and apply a dilute neem-oil spray at first sign.
Why is my heuchera 'green spice' heaving?
Freeze-thaw cycles can push shallow-rooted crowns out of the ground; mulch lightly around (not over) the crown in autumn.