Troubleshooting
Marigold problems — and how to fix them
Marigold (Tagetes) 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.
Stop flowering in midsummer
Deadhead regularly to keep flowers coming.
Powdery mildew
Wet humid weather; improve spacing and airflow.
Slug damage on young plants
Slug barriers or trapping; established plants are tougher.
Spider mites
Hot dry conditions; rinse with water and treat severe infestations.
Prevent marigold problems before they start
Most marigold issues are care-mismatch, not bad luck. Dial in the basics:
Marigold problems — FAQ
Why is my marigold stop flowering in midsummer?
Deadhead regularly to keep flowers coming.
Why is my marigold powdery mildew?
Wet humid weather; improve spacing and airflow.
Why is my marigold slug damage on young plants?
Slug barriers or trapping; established plants are tougher.
Why is my marigold spider mites?
Hot dry conditions; rinse with water and treat severe infestations.