Troubleshooting
Wall Rue problems — and how to fix them
Wall Rue (Asplenium ruta-muraria) 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.
Transplant failure
Wall rue strongly resents disturbance and rarely survives being dug from a wall. Establish it from spores in situ rather than moving wild plants.
Rich or acidic soil
It needs lime and lean conditions; rich compost or acidic ground kills it. Grow in mortar, tufa or gritty alkaline mix only.
Overwatering
Adapted to drought, its roots rot if kept wet. Water sparingly and ensure razor-sharp drainage.
Competition and smothering
Mosses and vigorous neighbours can crowd out this slow, tiny fern. Keep its crevice clear of encroaching growth.
Prevent wall rue problems before they start
Most wall rue issues are care-mismatch, not bad luck. Dial in the basics:
Looking for wall rue in general rather than its problems? Read the full wall rue care guide — light, water, soil and feeding.
Wall Rue problems — FAQ
Why is my wall rue transplant failure?
Wall rue strongly resents disturbance and rarely survives being dug from a wall. Establish it from spores in situ rather than moving wild plants.
Why is my wall rue rich or acidic soil?
It needs lime and lean conditions; rich compost or acidic ground kills it. Grow in mortar, tufa or gritty alkaline mix only.
Why is my wall rue overwatering?
Adapted to drought, its roots rot if kept wet. Water sparingly and ensure razor-sharp drainage.
Why is my wall rue competition and smothering?
Mosses and vigorous neighbours can crowd out this slow, tiny fern. Keep its crevice clear of encroaching growth.