Troubleshooting
Scarlet Monkeyflower problems — and how to fix them
Scarlet Monkeyflower (Mimulus cardinalis) 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.
Spider Mites
Hot, dry conditions encourage spider mite infestations on the underside of leaves, causing stippled, yellowing foliage; increase humidity, mist regularly, and treat with insecticidal soap.
Crown and Root Rot
Despite needing wet soil, standing water around the crown in cold or poorly aerated conditions leads to fungal rot — grow in flowing or well-aerated marginal positions rather than stagnant boggy ground.
Prevent scarlet monkeyflower problems before they start
Most scarlet monkeyflower issues are care-mismatch, not bad luck. Dial in the basics:
Scarlet Monkeyflower problems — FAQ
Why is my scarlet monkeyflower spider mites?
Hot, dry conditions encourage spider mite infestations on the underside of leaves, causing stippled, yellowing foliage; increase humidity, mist regularly, and treat with insecticidal soap.
Why is my scarlet monkeyflower crown and root rot?
Despite needing wet soil, standing water around the crown in cold or poorly aerated conditions leads to fungal rot — grow in flowing or well-aerated marginal positions rather than stagnant boggy ground.