Troubleshooting
Red Barrenwort problems — and how to fix them
Red Barrenwort (Epimedium x rubrum) 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.
Old foliage masking spring flowers
The semi-evergreen foliage persists through winter and can obscure emerging flowers. Cut all growth to within a few centimetres of the ground in late winter before buds break — typically February in the UK, March in colder US zones.
Mosaic virus causing mottled foliage
Occasionally affected by aphid-transmitted viruses that cause yellow mottling. Remove and destroy affected plant material and control aphid populations with insecticidal soap. There is no cure for viral infection.
Invasion of neighbouring plantings
More vigorous than many Epimediums; can spread into adjacent groundcovers over time. Use edging boards or root barriers to contain the planting if growing alongside less vigorous perennials.
Prevent red barrenwort problems before they start
Most red barrenwort issues are care-mismatch, not bad luck. Dial in the basics:
Red Barrenwort problems — FAQ
Why is my red barrenwort old foliage masking spring flowers?
The semi-evergreen foliage persists through winter and can obscure emerging flowers. Cut all growth to within a few centimetres of the ground in late winter before buds break — typically February in the UK, March in colder US zones.
Why is my red barrenwort mosaic virus causing mottled foliage?
Occasionally affected by aphid-transmitted viruses that cause yellow mottling. Remove and destroy affected plant material and control aphid populations with insecticidal soap. There is no cure for viral infection.
Why is my red barrenwort invasion of neighbouring plantings?
More vigorous than many Epimediums; can spread into adjacent groundcovers over time. Use edging boards or root barriers to contain the planting if growing alongside less vigorous perennials.