Troubleshooting
Bicolor Barrenwort problems — and how to fix them
Bicolor Barrenwort (Epimedium x versicolor) 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.
Vine weevil
Larvae feed on roots, causing sudden wilting and collapse of individual shoots. Check for characteristic C-shaped grubs in the root zone. Treat with biological control (Steinernema kraussei nematodes) applied in late summer when soil is warm and moist.
Mosaic virus
Yellow mottling and distortion of leaves can indicate viral infection. No chemical cure; remove and destroy affected plants. Maintain healthy growing conditions and control aphids, which spread viruses.
Winter foliage tattering
Cold, drying winds shred the semi-evergreen foliage. Cut all old leaves to the ground in late winter, before flower buds emerge, to reveal the flowers and encourage fresh growth.
Prevent bicolor barrenwort problems before they start
Most bicolor barrenwort issues are care-mismatch, not bad luck. Dial in the basics:
Bicolor Barrenwort problems — FAQ
Why is my bicolor barrenwort vine weevil?
Larvae feed on roots, causing sudden wilting and collapse of individual shoots. Check for characteristic C-shaped grubs in the root zone. Treat with biological control (Steinernema kraussei nematodes) applied in late summer when soil is warm and moist.
Why is my bicolor barrenwort mosaic virus?
Yellow mottling and distortion of leaves can indicate viral infection. No chemical cure; remove and destroy affected plants. Maintain healthy growing conditions and control aphids, which spread viruses.
Why is my bicolor barrenwort winter foliage tattering?
Cold, drying winds shred the semi-evergreen foliage. Cut all old leaves to the ground in late winter, before flower buds emerge, to reveal the flowers and encourage fresh growth.