I’m turning an old shed base area in to a gravel patio this year, and I want to add a load of potted plants so it’s not just a sea of gravel (can’t plant into the ground here as there are sections of concrete which I’m avoiding having to break/dig up)
I want to add some evergreens so that I have some year round foliage, but getting conflicting ideas between the gardening sites so would love some recommendations and to hear what has actually worked for others 
It’s a north facing spot, against a fence and a brick shed to the side of it. No particular preferences on look/size/maintenance while I gather ideas (though of course lower maintenance is better!)