Troubleshooting
Janke's Gesneriad problems — and how to fix them
Janke's Gesneriad (Jancaea heldreichii) 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.
Botrytis (grey mould) on the rosette
The densely hairy leaves trap moisture, creating ideal conditions for Botrytis cinerea in poor ventilation; grow in an alpine house with good airflow and remove any dead or dying leaves promptly.
Vine weevil larval root damage
Vine weevil grubs feed unseen on the roots of container-grown alpine plants; apply a horticultural grit top-dressing to deter egg-laying and consider nematode biological control in late summer.
Prevent janke's gesneriad problems before they start
Most janke's gesneriad issues are care-mismatch, not bad luck. Dial in the basics:
Janke's Gesneriad problems — FAQ
Why is my janke's gesneriad botrytis (grey mould) on the rosette?
The densely hairy leaves trap moisture, creating ideal conditions for Botrytis cinerea in poor ventilation; grow in an alpine house with good airflow and remove any dead or dying leaves promptly.
Why is my janke's gesneriad vine weevil larval root damage?
Vine weevil grubs feed unseen on the roots of container-grown alpine plants; apply a horticultural grit top-dressing to deter egg-laying and consider nematode biological control in late summer.