Troubleshooting
Coneflower 'White Swan' problems — and how to fix them
Coneflower 'White Swan' (Echinacea purpurea) 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.
Aster yellows
Phytoplasma infection causes distorted, yellowing flowers and stunted growth; no cure, remove and dispose of affected plants, and control the leafhoppers that spread it.
Powdery mildew
White coating on leaves in dry conditions; plant with good airflow and water at the base. Resistant varieties are available.
Crown rot
Occurs in poorly drained or overly wet soils; ensure free drainage and do not over-mulch the crown.
Vine weevil
Root damage by vine weevil larvae causes wilting; apply nematodes in late summer in affected areas.
Short-lived in heavy clay
Echinacea is naturally prairie-adapted; in heavy clay gardens, raise beds or incorporate grit to improve drainage.
Prevent coneflower 'white swan' problems before they start
Most coneflower 'white swan' issues are care-mismatch, not bad luck. Dial in the basics:
Coneflower 'White Swan' problems — FAQ
Why is my coneflower 'white swan' aster yellows?
Phytoplasma infection causes distorted, yellowing flowers and stunted growth; no cure, remove and dispose of affected plants, and control the leafhoppers that spread it.
Why is my coneflower 'white swan' powdery mildew?
White coating on leaves in dry conditions; plant with good airflow and water at the base. Resistant varieties are available.
Why is my coneflower 'white swan' crown rot?
Occurs in poorly drained or overly wet soils; ensure free drainage and do not over-mulch the crown.
Why is my coneflower 'white swan' vine weevil?
Root damage by vine weevil larvae causes wilting; apply nematodes in late summer in affected areas.
Why is my coneflower 'white swan' short-lived in heavy clay?
Echinacea is naturally prairie-adapted; in heavy clay gardens, raise beds or incorporate grit to improve drainage.