With the exception of a few feet near one fence, the entire garden is covered first by ground cloth, then by mulch. The intention was to keep weeds at a minimum. That has worked well except for crabgrass. It is undaunted by anything, growing up through the cloth. I have been trying to remove it the hard way but cannot get to most of the roots because of the cloth. Assuming the cloth is pulled back and roots removed, would it be better to use a heavier cloth topped by mulch or no cloth at all?