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Aaaargh!!!
Don't you just hate it when you inadvertently cause the demise of one of your favourite plants? I cut back my Eryngium 'Big Blue' several weeks after it had finished flowering because it was all brown & tatty and was obscuring the view of my Agastache 'Blue Boa' in full flower. I looked yesterday and it had completely rotted off at ground level.
It was a cracker as well. Aaaargh!!!

It was a cracker as well. Aaaargh!!!

Clay soil - Cheshire/Derbyshire border.
I play with plants and soil and sometimes it's successful
I play with plants and soil and sometimes it's successful
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It was rather nice. Unfortunately I don't think it'll recover - it's all mush below the soil. I'll get another one next spring. A lesson learned!
I play with plants and soil and sometimes it's successful
You have me worried now, as I did the same thing, same Eryngium and we have clay too. My favourite Planty Aunt who gardens gave me a piece of hers and it so far has survived, not as nice as yours looked yet.
I put a lot of grit in when I planted it, not too deeply and have a fair bit scattered over the top.
I wonder do they come true from seed? I noticed a seedling plant nearby ours. Maybe you have some too.
But like you said, probably better off buying a nice new one in spring. I think they are worth it.
I'm being greedy of course as we have another 'Big Blue' in my wife's island bed (yes we have his & hers beds!) plus another four Eryngium cultivars (mine, all mine!) elsewhere in our front garden. I always recall buying my first one from Carol Klein at one of the shows way back. But the more recent 'Big Blue' is definitely the one to go for, showing just how good the breeding has become. Such an exquisite flower.
@Rubytoo yes we're on clay but I've only ever planted Eryngiums in beds that have good free-draining topsoil on top and get lots of sun.
I play with plants and soil and sometimes it's successful
It does not look quite big enough to be a queen buff bumble?
Bees , be it bumbles or anything with a hint of yellow on anything blue or purple look so nice.
I also nowadays prefer to buy a new plant or grow things that mature fast/easy.
I decided that I am now too old to wait for things to mature compared to when I was younger.
Separate beds really... sorry... we won't go there
Hope your new one will do better in spring.
We have clay and a mostly tree covered garden so the sunny spots are at a premium , still I try