Troubleshooting
Brown-eyed Susan problems — and how to fix them
Brown-eyed Susan (Rudbeckia triloba) 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.
Aggressive self-seeding
Produces abundant seed and can spread widely. Deadhead before seed sets if you want to limit its colonising.
Powdery mildew
Can appear late season in humid, still conditions, though the airy habit helps. Improve airflow and remove affected foliage.
Flopping in shade or rich soil
Tall stems lean when grown in too much shade or over-fertile ground. Site in full sun for self-supporting plants.
Short lifespan
Individual plants are short-lived; rely on its prolific self-seeding or divide young clumps to keep a colony going.
Prevent brown-eyed susan problems before they start
Most brown-eyed susan issues are care-mismatch, not bad luck. Dial in the basics:
Looking for brown-eyed susan in general rather than its problems? Read the full brown-eyed susan care guide — light, water, soil and feeding.
Brown-eyed Susan problems — FAQ
Why is my brown-eyed susan aggressive self-seeding?
Produces abundant seed and can spread widely. Deadhead before seed sets if you want to limit its colonising.
Why is my brown-eyed susan powdery mildew?
Can appear late season in humid, still conditions, though the airy habit helps. Improve airflow and remove affected foliage.
Why is my brown-eyed susan flopping in shade or rich soil?
Tall stems lean when grown in too much shade or over-fertile ground. Site in full sun for self-supporting plants.
Why is my brown-eyed susan short lifespan?
Individual plants are short-lived; rely on its prolific self-seeding or divide young clumps to keep a colony going.