Any advise welcome
We have a retaining wall in our back garden made from railway sleepers. The water from the top part seeps down under the wall. I have cut out several little beds at the bottom of the wall, but as we have horrendous clay soil with awful drainage, everything I plant eventually dies off, the roots having drowned and rotted off. Any suggestions as to what I could plant there - ideally something evergreen, growing to about three or four feet tall! A tall order methinks!