Troubleshooting
Agave-Leaved Sea Holly problems — and how to fix them
Agave-Leaved Sea Holly (Eryngium agavifolium) 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.
Winter wet / crown rot
The main killer — saturated soil in winter causes the crown to rot. Improve drainage before planting and, in wet climates, shelter plants or apply a gravel collar around the crown.
Slow re-establishment after division
Dividing the clump severs the deep taproot and plants may sulk or fail; propagate from root cuttings in late winter rather than division where possible.
Prevent agave-leaved sea holly problems before they start
Most agave-leaved sea holly issues are care-mismatch, not bad luck. Dial in the basics:
Agave-Leaved Sea Holly problems — FAQ
Why is my agave-leaved sea holly winter wet / crown rot?
The main killer — saturated soil in winter causes the crown to rot. Improve drainage before planting and, in wet climates, shelter plants or apply a gravel collar around the crown.
Why is my agave-leaved sea holly slow re-establishment after division?
Dividing the clump severs the deep taproot and plants may sulk or fail; propagate from root cuttings in late winter rather than division where possible.