Troubleshooting
Penny Yellow Viola problems — and how to fix them
Penny Yellow Viola (Viola cornuta) 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.
Aphids
Particularly common on young growth; treat with insecticidal soap or neem oil spray.
Botrytis grey mould
On spent flowers in humid, cool conditions; deadhead regularly and improve airflow.
Slugs and snails
Damage young plants and flowers; iron phosphate pellets are effective.
Powdery mildew
Appears in late summer; avoid stress and ensure plants are not allowed to dry out.
Crown rot
In poorly drained sites; improve soil structure before planting.
Prevent penny yellow viola problems before they start
Most penny yellow viola issues are care-mismatch, not bad luck. Dial in the basics:
Penny Yellow Viola problems — FAQ
Why is my penny yellow viola aphids?
Particularly common on young growth; treat with insecticidal soap or neem oil spray.
Why is my penny yellow viola botrytis grey mould?
On spent flowers in humid, cool conditions; deadhead regularly and improve airflow.
Why is my penny yellow viola slugs and snails?
Damage young plants and flowers; iron phosphate pellets are effective.
Why is my penny yellow viola powdery mildew?
Appears in late summer; avoid stress and ensure plants are not allowed to dry out.
Why is my penny yellow viola crown rot?
In poorly drained sites; improve soil structure before planting.