Retaining wall fill dirt - can it contain old sod?
Hello - I'm digging up old weedy sod in one place and want to build a couple retaining walls with steps going down through them in another place and was wondering if it's possible to use some of the huge clumps of grass/dirt to fill part of the retaining wall area with. I know if it's too close to the top the grass will grow, but how deep down would it have to be to NOT grow? Or is there something else I should do, etc. Thanks!