Troubleshooting
Missouri Coneflower problems — and how to fix them
Missouri Coneflower (Rudbeckia missouriensis) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Root rot in wet or heavy soils
Being adapted to sharply drained limestone glades, this species is intolerant of waterlogged conditions. Plant in well-drained, gritty or rocky soil and avoid irrigating established plants except during severe drought.
Powdery mildew
Can appear on foliage in late summer in humid, crowded conditions. The open branching habit generally provides sufficient airflow to limit severity. Improve plant spacing and avoid overhead watering if mildew is problematic.
Prevent missouri coneflower problems before they start
Most missouri coneflower issues are care-mismatch, not bad luck. Dial in the basics:
Missouri Coneflower problems — FAQ
Why is my missouri coneflower root rot in wet or heavy soils?
Being adapted to sharply drained limestone glades, this species is intolerant of waterlogged conditions. Plant in well-drained, gritty or rocky soil and avoid irrigating established plants except during severe drought.
Why is my missouri coneflower powdery mildew?
Can appear on foliage in late summer in humid, crowded conditions. The open branching habit generally provides sufficient airflow to limit severity. Improve plant spacing and avoid overhead watering if mildew is problematic.