Troubleshooting
Castilian Heron's Bill problems — and how to fix them
Castilian Heron's Bill (Erodium castellanum) 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.
Winter wet and crown rot
The primary killer of this species in UK and northern US gardens; excess soil moisture around the crown in cold winters causes rapid fungal collapse — plant in scree or a trough with excellent drainage, and protect with a pane of glass or cloche during very wet winters.
Aphid infestations in spring
New soft growth can attract greenfly in spring; treat early with a strong water spray or insecticidal soap before populations build, as aphids can stunt flowering shoots and spread virus.
Prevent castilian heron's bill problems before they start
Most castilian heron's bill issues are care-mismatch, not bad luck. Dial in the basics:
Castilian Heron's Bill problems — FAQ
Why is my castilian heron's bill winter wet and crown rot?
The primary killer of this species in UK and northern US gardens; excess soil moisture around the crown in cold winters causes rapid fungal collapse — plant in scree or a trough with excellent drainage, and protect with a pane of glass or cloche during very wet winters.
Why is my castilian heron's bill aphid infestations in spring?
New soft growth can attract greenfly in spring; treat early with a strong water spray or insecticidal soap before populations build, as aphids can stunt flowering shoots and spread virus.