Ideas for planting at the base of a wall.
in Plants
We’ve got a really nice dry stone wall that is west facing. We’re in the process of rebuilding it as it was close to collapse. I’d now like some ideas of how best to dress it. I’ve thought of some group 3 clematis here and there, but I’d also like some ideas for planting at the base and anything safe to plant actually in it. The wall is about 3 feet high and about 20ft long. I don’t want to hide the wall at all, but rather show it off and punctuate it with colour. I already have lots of daffs, primroses and crocuses in the spring, but what else would look good there? Picture attached. Excuse the shadow but it should give some idea.

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In terms of planting in the cracks, things like Antirrhinum and wallflowers will colonise naturally by seed if you grow them nearby, but avoid Centranthus ruber, whose roots can weaken a wall, and also ivy. You can create a kind of 'plant plug' of Sempervivums and Sedum album and poke those into larger crevices--not all will take hold, but some will, and as I say, I think you want to go minimalist with this.
So, for example, you could add snapdragons and wallflowers to the mix at the base. I'd aim for fairly low-growing things like these, mixing with daffodils and tulips that have a fairly naturalistic look, like Narcissus 'Thalia' and lily-flowered tulips. If you want to break up the line created by the wall and the hedge behind, how about a single fairly narrow-growing small tree in front of it, to one side, that would provide wonderful autumn colour? Something like Amelanchier 'Robin Hill' might work, or Cercidiphyllum 'Rotfuchs'.
I would be tempted to plant a a few lavenders (and why not a hedge of them) as they are evergreen, smell beautiful and bees love them. They also wouldn't be so tall that they hide the wall. The grey-green colour of the foliage would also complement the colour of the stone nicely.
I think lavender will look great against that wall. Not sure about campanula and wall damage though, I only have mine at the (metal) edge of a raised bed.