Troubleshooting
Zinnia problems — and how to fix them
Zinnia (Zinnia elegans) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Powdery mildew
Choose resistant varieties (the Profusion and Zahara series are excellent) and water at the soil line.
Floppy stems
Insufficient light or over-rich soil.
Damping-off in seedlings
Wet cool conditions; sow into clean mix and don’t over-water.
Japanese beetles (US)
Hand-pick from flowers in the morning.
Prevent zinnia problems before they start
Most zinnia issues are care-mismatch, not bad luck. Dial in the basics:
Zinnia problems — FAQ
Why is my zinnia powdery mildew?
Choose resistant varieties (the Profusion and Zahara series are excellent) and water at the soil line.
Why is my zinnia floppy stems?
Insufficient light or over-rich soil.
Why is my zinnia damping-off in seedlings?
Wet cool conditions; sow into clean mix and don’t over-water.
Why is my zinnia japanese beetles (us)?
Hand-pick from flowers in the morning.