Troubleshooting
Flat Sea Holly problems — and how to fix them
Flat Sea Holly (Eryngium planum) 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.
Leaf and bud eelworm
Microscopic nematodes cause angular brown patches between leaf veins and distorted, stunted buds; destroy affected material and do not replant Eryngium in the same spot.
Powdery mildew
Appears in late summer, especially in dry conditions with poor airflow; good plant spacing and removal of affected leaves reduce spread.
Prevent flat sea holly problems before they start
Most flat sea holly issues are care-mismatch, not bad luck. Dial in the basics:
Flat Sea Holly problems — FAQ
Why is my flat sea holly leaf and bud eelworm?
Microscopic nematodes cause angular brown patches between leaf veins and distorted, stunted buds; destroy affected material and do not replant Eryngium in the same spot.
Why is my flat sea holly powdery mildew?
Appears in late summer, especially in dry conditions with poor airflow; good plant spacing and removal of affected leaves reduce spread.