Troubleshooting
Purple Jerusalem Sage problems — and how to fix them
Purple Jerusalem Sage (Phlomis purpurea) 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.
Root rot in cold, wet soils
Standing water around the crown in winter is fatal; improve drainage with grit mulch and avoid watering from late September onward in cool climates.
Aphid infestations on new growth
Soft spring growth can attract aphid colonies; knock off with a strong jet of water or apply an insecticidal soap spray, avoiding flowering periods to protect pollinators.
Prevent purple jerusalem sage problems before they start
Most purple jerusalem sage issues are care-mismatch, not bad luck. Dial in the basics:
Purple Jerusalem Sage problems — FAQ
Why is my purple jerusalem sage root rot in cold, wet soils?
Standing water around the crown in winter is fatal; improve drainage with grit mulch and avoid watering from late September onward in cool climates.
Why is my purple jerusalem sage aphid infestations on new growth?
Soft spring growth can attract aphid colonies; knock off with a strong jet of water or apply an insecticidal soap spray, avoiding flowering periods to protect pollinators.