Like John grew Charlotte in 3 no dig raised beds and when it came to earthing up in one I just put compost around the plants in the other after applying slug bait I covered with a weed fabric , the other I just covered with lots of grass clippings. They all did really well but the one with the compost over them did really well. The real bonus all of them were spotlessly clean and a quick wash under the tap was all they needed prior to cooking. I would say though that the bed with the grass clippings has shown some grass growth but nothing that half an hour weeding will not sort out.