Weed fabric is pretty pointless. Crab grass grows right through it. Well, it grows through everything, really. All my experiments with fabric have failed. I used some extra heavy duty garbage bags kind of around the inside, and put the dirt on top, while leaving the centre area bare grass. This in theory prevents grass from creeping in the sides, but allows water to drain and worms to get in. Mine are fairly deep, at least a foot so that killed the grass on its own. I haven't had much for problems, but it has only been in place a year like this. I'd call it a success though.
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