Posted: 23/09/2013 at 09:56
How unstable is it? It will naturally lose lose soil after it rains.
I put a lot of Dogwood, Juniper and Primrose on a similar though not as steep part of my garden and it has worked well to date. I put in some treated decking boards at the top, middle and bottom of the slope to help contain it as well, with some rocks behind those for drainage and strength with plants in between.