I have one of these in front of my house. From what I could see the previous owner was not very smart when he built this, it is sloped toward the house and moreover this is on the north side of the house, it gets sun light for a 1-2 hours in the afternoon so not only that it is not very practical for flowers (he put some shrubs there that are struggling to survive) but it seems to retain water (I can see some moss building up there)

Question: after I slope this correctly by adding more dirt how do I drain this? Do I need to drain it at the upper level or should I build something that is dug in and drain it at the base level (the grass level in the picture)

Thanks lot

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1 Answer 1


It's un-mortared blocks. No particular effort beyond that should be required, unless it's lined with plastic that needs holes poked in it. Every joint between blocks is a drainage point.

  • Then should I just slope the soil behind the wall ?
    – MiniMe
    Apr 11, 2015 at 1:02
  • That, and check that there isn't a plastic liner, or if there is, poke it full of holes on the outside/bottom.
    – Ecnerwal
    Apr 11, 2015 at 1:47
  • Well I had a quick look at the wall and guess what, the stones are glues to each other, one layer to the one underneath ... so what do I do now :D
    – MiniMe
    Apr 17, 2015 at 23:44
  • So? I still very much doubt it's even close to watertight.
    – Ecnerwal
    Apr 18, 2015 at 2:33
  • I will test it pouring water near the wall to see if it comes out on the other side
    – MiniMe
    Apr 18, 2015 at 2:45

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