Troubleshooting
Forsythia Sage problems — and how to fix them
Forsythia Sage (Salvia madrensis) 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.
Frost dieback
Top growth is cut by frost below about -3 °C, but established crowns reshoot from the base in spring if the roots are mulched over winter.
Aphid infestations
Soft new stem tips attract aphids, particularly in spring; blast off with water or treat with an insecticidal soap spray, and avoid over-fertilising with nitrogen.
Prevent forsythia sage problems before they start
Most forsythia sage issues are care-mismatch, not bad luck. Dial in the basics:
Forsythia Sage problems — FAQ
Why is my forsythia sage frost dieback?
Top growth is cut by frost below about -3 °C, but established crowns reshoot from the base in spring if the roots are mulched over winter.
Why is my forsythia sage aphid infestations?
Soft new stem tips attract aphids, particularly in spring; blast off with water or treat with an insecticidal soap spray, and avoid over-fertilising with nitrogen.