A few weeks ago, I laid out a healthy chunk o' overlapping cardboard over a never-to-be-sufficiently-@#$% section of Bermuda grass, set a 4' x 4' raised bed frame over the top, laid some more cardboard inside so the flaps came up the sides, then dumped a bunch of twigs and mulch to hold it down. Last week, it was filled in with soil and a slew of crushed egg shells. Just a few yards down from there, the roots of this stuff have survived six months being buried by bags of mulch, so I do have concerns about the grass growing back up and into the bed. So, I guess my question to tie in with Natalie's is how thick of a layer of cardboard do you all put down?
