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Unthrifty Eryngiums

Morning all
Can anyone suggest why my group of 3 Eryngium alpinum 'Superbum' are looking increasingly poorly? I bought them at a plant fair earlier this year, when of course they all looked fine. One put on lots of early growth and subsequently, very impressive flower spike. The other two have grown only very slowly and each new leaf, of which there are very few, starts turning yellow almost as soon as it appears, eventually turning brown and dry. The plant that flowered is now showing the same symptoms.
They are planted in an open, east-facing border that receives full sun until about 2pm. The soil is fairly poor, free-draining and sandy.
Thanks
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Posts
Thanks Verdun - so there's hope yet!
As far as my avatar is concerned, I was struggling to come up with anything appropriate, when a long-forgotten name from my childhood popped into my head. For many years, through the 1950's and 60's, summer holidays were spent at a NALGO holiday camp at Croyde Bay in north Devon. It had more than a touch of the Hi-de-Hi's about it, but that didn't detract from the magic of the place. Everyone had to have a 'camp' name and mine was 'Tigger'.
My somewhat large ears and nose have been commented on but at least they're not orange and I bounce up and down less than I used to!