Troubleshooting
Sticky Jerusalem Sage problems — and how to fix them
Sticky Jerusalem Sage (Phlomis viscosa) 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 and crown rot in wet winters
The most serious threat in UK gardens and wet-winter climates; plant in full sun on free-draining soil or raised beds, and do not mulch over the crown.
Leafhoppers
Sap-sucking leafhoppers can mottle and bleach the large leaves in summer; the sticky surface traps some insects but heavy infestations may need a pyrethrum-based spray.
Prevent sticky jerusalem sage problems before they start
Most sticky jerusalem sage issues are care-mismatch, not bad luck. Dial in the basics:
Sticky Jerusalem Sage problems — FAQ
Why is my sticky jerusalem sage root and crown rot in wet winters?
The most serious threat in UK gardens and wet-winter climates; plant in full sun on free-draining soil or raised beds, and do not mulch over the crown.
Why is my sticky jerusalem sage leafhoppers?
Sap-sucking leafhoppers can mottle and bleach the large leaves in summer; the sticky surface traps some insects but heavy infestations may need a pyrethrum-based spray.