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:
- Common greek jancaea problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Janke's Gesneriad watering schedule
- Janke's Gesneriad light requirements
- Best soil mix for janke's gesneriad
- Janke's Gesneriad temperature & humidity
- Full janke's gesneriad care guide
Looking for janke's gesneriad in general rather than its problems? Read the full janke's gesneriad care guide — light, water, soil and feeding.
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.