On Monday, 8 March 2021 at 11:13:51 UTC, AnthonyL wrote:
The upper part of the back garden is quite steep and during one of the
storms early last year a whole heap of shrubbery, earth slipped down
and over the retaining wall. A couple of trees were dislodged also.

There is a lot to clear up and I'm wondering about putting the
dislodge earth into sandbags and putting on top of and then behind the
retaining wall. This has the advantage of finding somewhere to put a
ton (guessing) of clay type soil, helping to stabilise against further
soil erosion and maybe helping to provide a platform to climb up and
maybe seed some suitable ground cover.

I guess I don't actually want it "flood proof" as I'd not want rain
build up behind.

So do you think the plan is workable? And what of the many varieties
of sandbag would be most suitable? It'll hopefully be there for a
while.

Any other tips?

--
AnthonyL

Why ever wait to finish a job before starting the next?

You might be better off using Gabions filled with stone. You do not need the enormous type you often see on motorways there are a variety of sizes. Just the facing side needs to be aesthetically arranged and the back filled ideally with limestone chips although any old rubble will do. They will let water through so no drainage problems and if you leave pockets of soil you can even get a few creepers to take hold.

Richard