"Wet newspapers and put layers around the plants overlapping as you go; cover with mulch and forget about weeds. Weeds will get through some gardening plastic; they will not get through wet newspaper. Good composting!" hum!
Wish I would have know this trick over 4 years ago. It would have saved countless hours of taking sod out & would have produced healthy soil also! Put cardboard & compost over grass in fall & by spring... you have healthy beds to plant in!