Troubleshooting
Black-eyed Susan 'Goldsturm' problems — and how to fix them
Black-eyed Susan 'Goldsturm' (Rudbeckia fulgida) 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
White coating on lower leaves, particularly in dry conditions; improve air circulation and water at the base. 'Goldsturm' is relatively resistant compared to other Rudbeckia.
Slugs on new growth
Young spring shoots are vulnerable; apply slug control early. Mature plants are less affected.
Leaf spot
Angular brown spots from fungal leaf-spot pathogens in wet conditions; improve airflow and remove affected leaves.
Clump decline
Centres of established clumps die out after 4-5 years; divide in spring to rejuvenate.
Aphids
Occasional infestations on new growth; usually managed by natural predators without intervention.
Prevent black-eyed susan 'goldsturm' problems before they start
Most black-eyed susan 'goldsturm' issues are care-mismatch, not bad luck. Dial in the basics:
Black-eyed Susan 'Goldsturm' problems — FAQ
Why is my black-eyed susan 'goldsturm' powdery mildew?
White coating on lower leaves, particularly in dry conditions; improve air circulation and water at the base. 'Goldsturm' is relatively resistant compared to other Rudbeckia.
Why is my black-eyed susan 'goldsturm' slugs on new growth?
Young spring shoots are vulnerable; apply slug control early. Mature plants are less affected.
Why is my black-eyed susan 'goldsturm' leaf spot?
Angular brown spots from fungal leaf-spot pathogens in wet conditions; improve airflow and remove affected leaves.
Why is my black-eyed susan 'goldsturm' clump decline?
Centres of established clumps die out after 4-5 years; divide in spring to rejuvenate.
Why is my black-eyed susan 'goldsturm' aphids?
Occasional infestations on new growth; usually managed by natural predators without intervention.