Troubleshooting
Black Spleenwort problems — and how to fix them
Black Spleenwort (Asplenium adiantum-nigrum) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Scale insects on frond stalks
Brown scale can colonise the dark, polished stipes, blending in with the stalk colour and going unnoticed; check closely and treat with a cotton bud dipped in methylated spirits or apply a systemic insecticide in spring.
Frond yellowing in waterlogged soil
Poorly drained or compacted soil causes yellowing and eventual root rot; replant into a gritty, free-draining mix and elevate the pot or plant slightly to improve air circulation around the crown.
Prevent black spleenwort problems before they start
Most black spleenwort issues are care-mismatch, not bad luck. Dial in the basics:
Black Spleenwort problems — FAQ
Why is my black spleenwort scale insects on frond stalks?
Brown scale can colonise the dark, polished stipes, blending in with the stalk colour and going unnoticed; check closely and treat with a cotton bud dipped in methylated spirits or apply a systemic insecticide in spring.
Why is my black spleenwort frond yellowing in waterlogged soil?
Poorly drained or compacted soil causes yellowing and eventual root rot; replant into a gritty, free-draining mix and elevate the pot or plant slightly to improve air circulation around the crown.