Should I plant this Eryngium Alpinus horizontal or vertical?

in Plants
Hi All! I've just had 3 of these delivered. The only thing I have read is that they can be prone to crown rot. Should they be planted horizontally shallow, like iris rhizomes or deep vertically? Proud crown or submerged? Thank you for any help. 


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You should plant it horizontally, with the crown at ground level, or slightly under. In my experience, even when planted deeply, they still do well.
The most important thing is to get it into some soil straight away. As it's nearly December, and frosts are quite regular (and the ground quite cold and hard), I would put it into a pot for the Winter, and ideally keep the pot somewhere sheltered (like an an unheated greenhouse). Putting a bare root perennial into freezing cold ground now might shock the plant and kill it.
If they're on the small side, it's always better to err on the side of caution and pot them.
I see you are similarly located to me @Fairygirl - so your advice is worth taking extra notice...