Troubleshooting
Rudbeckia 'Indian Summer' problems — and how to fix them
Rudbeckia 'Indian Summer' (Rudbeckia hirta 'Indian Summer') 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
Especially late in the season. Improve air circulation and avoid overhead watering.
Aphids
Feed on tender growth; treat with insecticidal soap or a strong water jet.
Septoria leaf spot
Brown spots with yellow halos on lower leaves. Remove affected foliage and avoid wetting leaves.
Stem rot
Wet soil at the crown leads to collapse. Improve drainage and reduce watering frequency.
Deer browsing
Deer occasionally graze on Rudbeckia. Use repellents or fencing in affected gardens.
Prevent rudbeckia 'indian summer' problems before they start
Most rudbeckia 'indian summer' issues are care-mismatch, not bad luck. Dial in the basics:
Rudbeckia 'Indian Summer' problems — FAQ
Why is my rudbeckia 'indian summer' powdery mildew?
Especially late in the season. Improve air circulation and avoid overhead watering.
Why is my rudbeckia 'indian summer' aphids?
Feed on tender growth; treat with insecticidal soap or a strong water jet.
Why is my rudbeckia 'indian summer' septoria leaf spot?
Brown spots with yellow halos on lower leaves. Remove affected foliage and avoid wetting leaves.
Why is my rudbeckia 'indian summer' stem rot?
Wet soil at the crown leads to collapse. Improve drainage and reduce watering frequency.
Why is my rudbeckia 'indian summer' deer browsing?
Deer occasionally graze on Rudbeckia. Use repellents or fencing in affected gardens.