Posted: 24/06/2017 at 08:17
Hi, I think yiu need to go for really robust 'doers'.
It might be worth browsing the RHS plant finder and those on some of the nursery sites like Crocus. I would look at plants which like dry shade.
Some ferns are good for dry shade but won't quote names as I always have to check which is which.
ivy, as already suggested would give some glossy evergreen colour and some of the variegated are very pretty. You could use it as ground cover.
I have perennial sweet peas growing right against the house wall - never water them, they are definitely in the rainshadow and ithe soil is about 6inches front to back. They only get a few hours morning sun and are positively rampant so they might work - also I think the seeds are quite cheap.
I've grown rosemary quite successfully in partial shade and that likes dry conditions and doesn't need rich soil - the prostrate form would work well on your 'ledge'.
Cyclamen hederifolium will grown by dense hedges such as leylandii so they will probably cope and liriope muscari is as tough as old boots.
I would find just 3 or maybe four plants to try out and then use them as repeats along the full length
I didn't ask how shallow the soil is, but many plants don't need a huge depth. And you could always give them a top up with slow release food granules if they seem hungry.
Last edited: 24 June 2017 08:18:35