Eryngium Sea Holly in a pot ?

I have some in pots and they are doing fine, I think they pretty much are happy in most soils as long as they are free draining, I can't seem to remember what exact mix I used.

 

Just had a look in the pot and I've got grit in there so the mix would have probably been 50/50 JI no3 and mpc then added grit to suit.

 

@JWK Definitely agree that the problem is her soil. Eryngiums may be fine in a container for a couple of years, but I have to wonder if they will do well in anything but the largest, deepest pots with that big, carrot-like root! I have a vague memory of being advised against it when I asked here a couple of years ago. Why not simply dig a fairly deep hole and replace her soil with something lighter? I have mine in the ground in a 3 parts MPC, 1 part sand and 1 part grit mix, it seems to be doing fine in its second year despite initially suffering a bit of stress from being transplanted in the Spring.

Nick

 

It's a 12" 15l pot and I'll probably go up a size next year, no doubt it's better in soil but with limited soil to plant in I've learned to give it a go, if I lose this one I'll grow another one.