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Hardy perennials for border...

I’m hoping to put a border into my garden - I will be lifting the slabs shown in the attached photo and putting a border in front of the pebble dashed walls...
I live in the NW Highlands and so we often have cold weather and high winds - I am hoping that the wall will provide a degree of protection from the winds... I was looking for some advice as to the hardiest flowers that I could plant up (preferably perennials).
Also, I am hoping that we find soil underneath the slabs - however if not I will be looking to put my own soil down... how deep should I aim for the borders to be with soil for planting?
Many thanks to anyone in advance!
Aidan

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I would be tempted to plant in keeping with your (spectacular) environment.
Well isn’t that funny... you’ve reminded me of that as I saw it as well AND I live in Ullapool!
I shall have to try and find it online somewhere and watch it again... take note this time!
Thank you
2 Durnamuck (scotlandsgardens.org)
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
I found this for the OP Exposed Coastal Garden - Shoot (shootgardening.co.uk)
You could create something similar using raised beds, with a very gritty soil mix to provide the sharp drainage. It would be quite nice to feel enclosed by raised beds.
I have to get the slabs lifted and see that it’s actually a possibility now; the two links you’ve given me are super helpful so fingers crossed!
Thanks again