Troubleshooting
Hairy alumroot problems — and how to fix them
Hairy alumroot (Heuchera villosa) 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
Heavy clay soils or overwatering cause crown rot, particularly over winter. Plant on a slight slope or raised bed and lift/divide congested clumps every 3–4 years, replanting the healthy outer crowns.
Vine weevil
Vine weevil larvae (Otiorhynchus sulcatus) eat roots, causing sudden plant collapse. Check for C-shaped grubs when dividing. Apply pathogenic nematodes (Steinernema kraussei) to the soil in late summer as a biological control.
Foliar nematodes
Brown, angular patches between leaf veins indicate foliar nematode (Aphelenchoides spp.) damage. Remove and destroy affected leaves; avoid overhead watering. No effective chemical control is registered for home gardens.
Prevent hairy alumroot problems before they start
Most hairy alumroot issues are care-mismatch, not bad luck. Dial in the basics:
Looking for hairy alumroot in general rather than its problems? Read the full hairy alumroot care guide — light, water, soil and feeding.
Hairy alumroot problems — FAQ
Why is my hairy alumroot crown rot?
Heavy clay soils or overwatering cause crown rot, particularly over winter. Plant on a slight slope or raised bed and lift/divide congested clumps every 3–4 years, replanting the healthy outer crowns.
Why is my hairy alumroot vine weevil?
Vine weevil larvae (Otiorhynchus sulcatus) eat roots, causing sudden plant collapse. Check for C-shaped grubs when dividing. Apply pathogenic nematodes (Steinernema kraussei) to the soil in late summer as a biological control.
Why is my hairy alumroot foliar nematodes?
Brown, angular patches between leaf veins indicate foliar nematode (Aphelenchoides spp.) damage. Remove and destroy affected leaves; avoid overhead watering. No effective chemical control is registered for home gardens.