Troubleshooting
Creeping Comfrey problems — and how to fix them
Creeping Comfrey (Symphytum grandiflorum) 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.
Rust (Puccinia cynoglossi)
Orange-brown pustules appear on leaf undersides in humid conditions; remove and dispose of affected leaves and improve spacing to increase airflow.
Slug and snail damage
Young spring growth is especially vulnerable to slug grazing, leaving ragged holes in emerging leaves; use iron phosphate pellets or biological nematode controls.
Failure to spread in dry soil
In very dry, compacted soils the creeping rhizomes establish slowly; mulch generously and water during the first season to help the mat form before withdrawing irrigation.
Prevent creeping comfrey problems before they start
Most creeping comfrey issues are care-mismatch, not bad luck. Dial in the basics:
Creeping Comfrey problems — FAQ
Why is my creeping comfrey rust (puccinia cynoglossi)?
Orange-brown pustules appear on leaf undersides in humid conditions; remove and dispose of affected leaves and improve spacing to increase airflow.
Why is my creeping comfrey slug and snail damage?
Young spring growth is especially vulnerable to slug grazing, leaving ragged holes in emerging leaves; use iron phosphate pellets or biological nematode controls.
Why is my creeping comfrey failure to spread in dry soil?
In very dry, compacted soils the creeping rhizomes establish slowly; mulch generously and water during the first season to help the mat form before withdrawing irrigation.