How long do you give them?

According to Chiltern Seeds, Eryngium are slow to germinate - detailed instructions at https://www.chilternseeds.co.uk/item_526...otts_ghost

Wow ! they can take a while. 

I’ve just come up with a very Veggie idea   , while I was eating my tea. I’m going to mix lots of my old flower seeds with some compost and scatter it around the post box bed. I don’t usually like just scattering seeds because we have so many voles & mice. I don’t think the seeds stand much of a chance. I’m hoping the additional compost will give them a little more of a chance. If I get lots of germination. I can transplant some of the seedlings.