Pest identification
What's eating my eryngium × zabelii 'big blue'?
Aphids
Signs: Colonies on upper stems and beneath bracts, leaving honeydew that attracts sooty mould and weakens flowering.
Control: Dislodge with a strong water spray; insecticidal soap or neem oil for persistent infestations in dry spells.
Slugs and snails
Signs: Ragged, silvery-trailed damage on emerging rosette leaves in late winter and early spring.
Control: Iron phosphate pellets or crushed grit around crowns as growth starts; hand-pick after rain at dusk.
Powdery mildew (stress-linked)
Signs: White powdery coating on leaves during hot, dry periods — more a stress response than a primary pest; weakens plant.
Control: Ensure good airflow; avoid overcrowding; water at the base in drought. Remove affected leaves promptly.
Keep eryngium × zabelii 'big blue' pest-free
Healthy plants resist pests best. Get the basics right:
Eryngium × zabelii 'Big Blue' pests — FAQ
What is eating my eryngium × zabelii 'big blue'?
Eryngium × zabelii 'Big Blue' is a vigorous hybrid sea holly resistant to most pests. Deer and rabbits avoid the spiny bracts. Aphids can settle on flower stems in summer. Slugs and snails target soft spring foliage before it hardens. Overall one of the lowest-maintenance perennials for garden pest pressure.
How do I get rid of aphids on eryngium × zabelii 'big blue'?
Colonies on upper stems and beneath bracts, leaving honeydew that attracts sooty mould and weakens flowering. Dislodge with a strong water spray; insecticidal soap or neem oil for persistent infestations in dry spells.
How do I get rid of slugs and snails on eryngium × zabelii 'big blue'?
Ragged, silvery-trailed damage on emerging rosette leaves in late winter and early spring. Iron phosphate pellets or crushed grit around crowns as growth starts; hand-pick after rain at dusk.
How do I get rid of powdery mildew (stress-linked) on eryngium × zabelii 'big blue'?
White powdery coating on leaves during hot, dry periods — more a stress response than a primary pest; weakens plant. Ensure good airflow; avoid overcrowding; water at the base in drought. Remove affected leaves promptly.