Troubleshooting
Amethyst Sea Holly problems — and how to fix them
Amethyst Sea Holly (Eryngium amethystinum) 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.
Crown rot
The single most common cause of plant death; caused by waterlogged soil in winter. Plant on a slope or raised bed with gritty drainage, or lift and store in a very dry shed if on heavy clay.
Leaf and bud eelworm (Aphelenchoides spp.)
Causes distorted, discoloured foliage and stunted flower heads. No chemical treatment is registered; remove and destroy affected plants and avoid replanting Eryngium in the same spot for several years.
Prevent amethyst sea holly problems before they start
Most amethyst sea holly issues are care-mismatch, not bad luck. Dial in the basics:
Amethyst Sea Holly problems — FAQ
Why is my amethyst sea holly crown rot?
The single most common cause of plant death; caused by waterlogged soil in winter. Plant on a slope or raised bed with gritty drainage, or lift and store in a very dry shed if on heavy clay.
Why is my amethyst sea holly leaf and bud eelworm (aphelenchoides spp.)?
Causes distorted, discoloured foliage and stunted flower heads. No chemical treatment is registered; remove and destroy affected plants and avoid replanting Eryngium in the same spot for several years.