Troubleshooting
Eryngium × zabelii 'Big Blue' problems — and how to fix them
Eryngium × zabelii 'Big Blue' (Eryngium × zabelii 'Big Blue') 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.
Crown and root rot
The single biggest killer; caused by wet, heavy or poorly drained soil, especially over winter. Plant in sharp drainage and never overwater.
Floppy, weak stems
Result of too much shade or overly rich, moist soil. Move to full sun and lean ground; avoid feeding.
Powdery mildew
Can coat the basal leaves in humid, crowded conditions. Improve airflow and avoid wetting foliage.
Transplant resentment
The deep taproot dislikes disturbance, so established plants move poorly. Site permanently and propagate from young material instead.
Prevent eryngium × zabelii 'big blue' problems before they start
Most eryngium × zabelii 'big blue' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for eryngium × zabelii 'big blue' in general rather than its problems? Read the full eryngium × zabelii 'big blue' care guide — light, water, soil and feeding.
Eryngium × zabelii 'Big Blue' problems — FAQ
Why is my eryngium × zabelii 'big blue' crown and root rot?
The single biggest killer; caused by wet, heavy or poorly drained soil, especially over winter. Plant in sharp drainage and never overwater.
Why is my eryngium × zabelii 'big blue' floppy, weak stems?
Result of too much shade or overly rich, moist soil. Move to full sun and lean ground; avoid feeding.
Why is my eryngium × zabelii 'big blue' powdery mildew?
Can coat the basal leaves in humid, crowded conditions. Improve airflow and avoid wetting foliage.
Why is my eryngium × zabelii 'big blue' transplant resentment?
The deep taproot dislikes disturbance, so established plants move poorly. Site permanently and propagate from young material instead.