Planting advice for north facing boarder


We have a narrow north facing border that I would like to plant up. It is the entrance to our home so I want something with impact. The soil depth is good and fresh compost/soil has been added. The border is only 40cm wide and is 7 metres long although towards the end it opens up to be around 60cm wide. I love formal Mediterranean gardens and love verbenas, agapanthus etc. I thought about yew as it can tolerate full shade but the balls would be too small to make impact. Has anyone got some ideas. I have attached photos.
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Polemonium, Dicentra and Camassias will all be fine. The last one needs soil that doesn't dry out. Native primulas, Hellebores, Daffs of all types - lots of spring bulbs are fine, Iberis [Perennial candytuft ] Carexes [not pendula- the invasive one] and Philadelphus, will all grow in that aspect.
If you had enough room, and the soil is consistently damp enough, Acteas are great statement plants.
Lots of different clematis will grow there too.