I recently bought a house with a raised deck (maybe 4' above grade) with a flowerbed around it. As it stands, the flowerbed has a higher soil level, maybe 6" higher than the grade underneath the deck, so that the soil tends to slough under the deck. There used to be trellis around the edge of the deck but it was broken/rotten so we tore it out for now.
I think my options are (1) reduce the soil level in the flowerbed to grade so it doesn't slough, (2) install some sort of small retaining wall at the back.
If I went with (2) I'm not sure what I'd use for the wall or how I would interface that retaining wall with the trellis. One thought was to use keystone blocks and then let the trellis sit on top of them... another would be to use 4"x4" pieces of treated lumber as the wall and let the trellis sit on them... any thoughts? One thing I am trying to avoid here is the trellis getting buried and rotting.