I want to remove all of the green cover the previous owner had in the beds. In the past I've tried newspaper to cover up weeds but it just came back years later. I want to do it correctly this time. I could actually poison all of the cover but that feels wrong. I've also been told I can use the black fabric material to block out the light. My plan is to just remove everything except the shrubs and dark mulch it to get a clean start. What's the best way? I'm in Massachusetts zone 6A.