Troubleshooting
Hollow-Rooted Fumewort problems — and how to fix them
Hollow-Rooted Fumewort (Corydalis cava) 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.
Tuber hollowing and collapse
As tubers age, the hollow centre can become a site of fungal ingress if drainage is poor; replant in fresh, gritty leaf-mould soil every 3–4 years to maintain vigour and reduce disease pressure.
Self-seeding becoming invasive
Under ideal conditions Corydalis cava self-seeds prolifically and can crowd out smaller spring bulbs; deadhead promptly after flowering if controlled naturalising is preferred, or allow to spread freely in wilder garden areas.
Prevent hollow-rooted fumewort problems before they start
Most hollow-rooted fumewort issues are care-mismatch, not bad luck. Dial in the basics:
Hollow-Rooted Fumewort problems — FAQ
Why is my hollow-rooted fumewort tuber hollowing and collapse?
As tubers age, the hollow centre can become a site of fungal ingress if drainage is poor; replant in fresh, gritty leaf-mould soil every 3–4 years to maintain vigour and reduce disease pressure.
Why is my hollow-rooted fumewort self-seeding becoming invasive?
Under ideal conditions Corydalis cava self-seeds prolifically and can crowd out smaller spring bulbs; deadhead promptly after flowering if controlled naturalising is preferred, or allow to spread freely in wilder garden areas.