Troubleshooting
Germander Speedwell problems — and how to fix them
Germander Speedwell (Veronica chamaedrys) 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.
Downy mildew (Peronospora grisea)
A specific downy mildew affects Veronica species, causing grey-purple downy patches on the underside of leaves; improve air circulation and avoid wetting foliage when watering.
Vine weevil grub damage
Vine weevil larvae feed on roots causing plants to wilt suddenly; check soil around wilting plants for c-shaped white grubs and treat with pathogenic nematodes in late summer.
Prevent germander speedwell problems before they start
Most germander speedwell issues are care-mismatch, not bad luck. Dial in the basics:
Germander Speedwell problems — FAQ
Why is my germander speedwell downy mildew (peronospora grisea)?
A specific downy mildew affects Veronica species, causing grey-purple downy patches on the underside of leaves; improve air circulation and avoid wetting foliage when watering.
Why is my germander speedwell vine weevil grub damage?
Vine weevil larvae feed on roots causing plants to wilt suddenly; check soil around wilting plants for c-shaped white grubs and treat with pathogenic nematodes in late summer.